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JP2018133625

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DESCRIPTION JP2018133625
Abstract: The present invention provides a thermoacoustic apparatus and a sonic inspection
apparatus which have a relatively high strength of a heating element and a relatively high degree
of freedom in design. A thermoacoustic device comprises a heating element (2) formed of a nonwoven sheet containing fibrous carbon nanostructures. Preferably the heating element has a
three-dimensional shape. Preferably, the heating element is formed by bending the non-woven
sheet. The thermoacoustic apparatus may further include a plurality of electrodes 3 for applying
a current to the heating element. The thermoacoustic device may comprise three or more
electrodes and two or more heating elements. The thermoacoustic apparatus may further include
a heating device that irradiates the heating element with light or an electromagnetic wave. The
sonic inspection apparatus includes a thermoacoustic apparatus and a sonic wave receiving
element. [Selected figure] Figure 1
Thermoacoustic apparatus and sonic inspection apparatus
[0001]
The present invention relates to a thermoacoustic apparatus and a sonography apparatus.
[0002]
As a device for generating a sound wave, a sound wave generator using mechanical vibration
such as an electrodynamic conversion device including a magnet and a coil, a capacitor
conversion device, a conversion device using a piezoelectric material, etc. is widely used.
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In recent years, unlike these sound wave generators, development of a sound wave generator
(thermoacoustic apparatus) using a thermoacoustic effect that does not perform mechanical
vibration at all has been advanced.
[0003]
The thermoacoustic device expands the air in the vicinity of the heating element instantaneously
by applying an electric current to the heating element to cause the heating element to generate
heat instantaneously, or stopping the applied current to the heating element to thereby heat the
temperature of the heating element By constricting the gas around the heating element or by
forming the air tightness, the sound wave is generated. Since such a thermoacoustic apparatus
does not involve mechanical vibration, it has the advantages of a wide frequency band, being less
susceptible to the influence of the surrounding environment, and relatively easy to miniaturize.
[0004]
In the thermoacoustic apparatus, in order to enhance the generation efficiency of sound waves, it
has been proposed to use a structure in which a plurality of carbon nanotubes are connected by
an intermolecular force as a heating element (see Japanese Patent No. 4672783). According to
this thermoacoustic apparatus, since a carbon nanotube structure having a small heat capacity
and a large specific surface area is used for a heating element, high-speed temperature change
corresponding to an electric signal or the like is possible, and sound waves are good. It is
believed that it can occur.
[0005]
Patent No. 4672783
[0006]
However, the carbon nanotube structure used as a heating element in the above-mentioned
publication has a disadvantage that mechanical strength is small and it breaks easily.
[0007]
In addition, since the carbon nanotube structure having no rigidity needs to be stretched on a
05-05-2019
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structure such as an electrode, for example, the degree of freedom in design is small.
[0008]
SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present
invention to provide a thermoacoustic apparatus and a sonic inspection apparatus which have a
relatively high strength of a heating element and a relatively high degree of freedom in design.
[0009]
A thermoacoustic device according to an aspect of the present invention made to solve the above
problems is a thermoacoustic device including a heating element formed from a non-woven sheet
containing fibrous carbon nanostructures.
[0010]
In the thermoacoustic device according to one aspect of the present invention, it is preferable
that the heating element has a three-dimensional shape.
[0011]
In the thermoacoustic device according to one aspect of the present invention, the heat
generating body may be formed by bending the non-woven sheet.
[0012]
The thermoacoustic apparatus which concerns on 1 aspect of this invention may further be
equipped with the several electrode which applies an electric current to the said heat generating
body.
[0013]
The thermoacoustic apparatus which concerns on 1 aspect of this invention may be equipped
with three or more said electrodes and two or more said heat generating bodies.
[0014]
The thermoacoustic apparatus which concerns on 1 aspect of this invention may further be
equipped with the heating apparatus which irradiates light or electromagnetic waves to the said
heat generating body.
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[0015]
An ultrasonic inspection apparatus according to another aspect of the present invention is an
ultrasonic inspection apparatus including the above-described thermoacoustic apparatus and an
acoustic wave receiving element.
[0016]
In the present invention, the “fibrous carbon nanostructure” is, for example, a fibrous
nanotube having an outer diameter (fiber diameter) of less than 1 μm, such as carbon
nanotubes, carbon nanohorns, carbon nanofibers, carbon nanocoils, carbon microcoils, etc. It
means a carbon structure.
"Non-woven sheet" means a sheet formed into a sheet by bonding or entanglement by thermal,
mechanical or chemical action without weaving fibers, and it is not only a nonwoven but also a
paper-made article such as paper. In addition to planar ones, the concept includes, for example,
those formed to have a three-dimensional shape from the beginning, such as a pulp-made egg
packaging container.
[0017]
The thermoacoustic device of the present invention comprises a heating element formed of a
non-woven sheet containing fibrous carbon nanostructures (carbon nanotubes, carbon
nanohorns, graphene, carbon nanofibers, carbon nanocoils, carbon microcoils, etc.) Therefore,
since the rigidity of the heat generating body can be increased, the strength of the heat
generating body is large and the degree of freedom in design is relatively large.
[0018]
It is a typical sectional view showing the thermoacoustic device concerning one embodiment of
the present invention.
It is a schematic plan view of the thermoacoustic apparatus of FIG.
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It is a schematic plan view which shows the thermoacoustic apparatus different from FIG. 1 of
this invention.
It is a schematic cross section which shows the thermoacoustic apparatus which concerns on
embodiment different from FIG.1 and FIG.3 of this invention.
It is a typical sectional view showing the thermoacoustic device concerning the embodiment
different from Drawing 1, Drawing 3, and Drawing 4 of the present invention.
FIG. 6 is a schematic cross-sectional view showing a thermoacoustic apparatus according to an
embodiment different from FIGS. 1 and 3 to 5 of the present invention.
It is a schematic plan view of the thermoacoustic apparatus of FIG.
FIG. 7 is a schematic cross-sectional view showing a thermoacoustic device according to an
embodiment different from FIGS. 1 and 3 to 6 of the present invention.
It is a schematic plan view of the thermoacoustic apparatus of FIG.
It is a schematic cross section which shows the thermoacoustic apparatus which concerns on
embodiment different from FIG. 1, FIG. 3-FIG. 6 and FIG. 8 of this invention.
It is a schematic cross section which shows the thermoacoustic apparatus which concerns on
embodiment different from FIG. 1, FIG. 3 thru | or FIG. 6, 8 and 10 of this invention.
It is a typical sectional view showing the thermoacoustic device concerning the embodiment
different from Drawing 1, Drawing 3 thru / or 6, 8, 10, and 11 of the present invention. It is a
schematic plan view of the thermoacoustic apparatus of FIG. FIG. 13 is a schematic crosssectional view showing a thermoacoustic device according to an embodiment different from FIGS.
1, 3 to 6, 8, 10, 11 and 12 of the present invention. It is a schematic plan view of the
thermoacoustic apparatus of FIG. It is a typical sectional view showing a sonic inspection device
concerning one embodiment of the present invention. FIG. 17 is a schematic cross-sectional view
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showing a sonic inspection apparatus according to an embodiment different from FIG. 16 of the
present invention. FIG. 18 is a schematic cross-sectional view showing a sonic inspection
apparatus according to an embodiment different from FIGS.
[0019]
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings as appropriate.
[0020]
First Embodiment FIGS. 1 and 2 show a thermoacoustic apparatus according to an embodiment
of the present invention.
[0021]
The thermoacoustic apparatus includes a rectangular frame-shaped base member 1, a sheet-like
heating element 2 disposed so as to extend between two sides of the base member 1 in the
longitudinal direction, and both longitudinal sides of the heating element 2. And a pair of
electrodes 3 provided along the side edge of
In other words, in the thermoacoustic device, the heating element 2 is disposed between the pair
of electrodes 3.
Furthermore, the thermoacoustic apparatus includes a signal generator 5 for applying a drive
current between the pair of electrodes 3 via the wiring 4. Further, the thermoacoustic apparatus
further includes a fixing member 6 for fixing the heat generating body 2 to the base member 1
and a conductive member 7 for connecting the wiring 4 to the electrode 3.
[0022]
The thermoacoustic device expands a gas (for example, air, nitrogen, helium, etc.) around the
heating element 2 by applying a current to the heating element 2 by the signal generator 5 to
cause the heating element 2 to generate heat, By stopping the application of the current to the
heating element 2 to lower the temperature of the heating element 2, the gas around the heating
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element 2 is contracted. As a result, a pressure wave is generated in the gas around the heating
element 2 and this is emitted as a sound wave.
[0023]
[Base Member] The base member 1 is a member for supporting the heating element 2, is formed
of a sufficiently rigid material, and is substantially immobile by being fixed to its own inertia or
by being fixed to another structure. It is preferred to be arranged.
[0024]
Heating Element The heating element 2 is formed of a non-woven sheet containing a plurality of
fibrous carbon nanostructures, and is stretched on the base member 1 in a planar manner.
The base member 1 may be omitted by improving the rigidity of the end portion of the heating
element 2. As a method of improving the rigidity of the end portion of the heat generating
element 2, for example, the end portion may be bent into an L-shape, a U-shape, a □ -shape, a 型
-shape, and bonding may be performed as necessary. Good. In addition, the rigidity may be
improved by thickening the film thickness of the end portion of the heating element 2.
[0025]
The heat generating element 2 exhibits conductivity by bringing a plurality of fibrous carbon
nanostructures into contact with each other, and generates heat due to Joule loss at the time of
energization.
[0026]
As a fibrous carbon nanostructure contained in heating element 2, carbon nano materials such as
carbon nanotubes, carbon nanohorns, carbon nanofibers, carbon nanocoils, carbon microcoils,
etc. can be used alone or in combination of two or more kinds .
As a carbon nanotube, a single-walled single-walled nanotube (SWNT) or a multi-walled multiwalled nanotube (MWNT) can be used.
05-05-2019
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[0027]
The fibrous carbon nanostructures in the heating element 2 are preferably randomly arranged so
as not to have orientation. That is, it is preferable that the heating element 2 is isotropic in
electrical and mechanical properties in plan view. As a result, the manufacturing and handling of
the heating element 2 become easy, and the restriction on the shape of the heating element 2 is
reduced. For example, in order to improve heat dissipation, the electrical and mechanical
restrictions at the time of opening the heating element 2 are small, and it can be formed at any
position in any size.
[0028]
The heating element 2 may contain a binder. The heating element 2 can improve strength and
prevent scattering of the fibrous carbon nano structure by including a binder. Moreover, the
freedom degree of shaping | molding of the heat generating body 2 improves significantly
because the heat generating body 2 contains a binder.
[0029]
The heating element 2 may contain fibers and additives other than fibrous carbon
nanostructures. The heating element 2 improves its strength by including fibers other than
fibrous carbon nanostructures. Moreover, the electrical resistance of the heat generating body 2
can also be adjusted by doping a fibrous carbon nanostructure with an impurity, or containing
(mixing) fibers other than the fibrous carbon nanostructure.
[0030]
As a method of forming the heat generating element 2, wet papermaking using a fibrous carbon
nanostructure, needle punch, stitch bond, chemical bond or the like can be applied. Moreover, as
a method of forming the heating element 2, in addition to a method of producing a non-woven
sheet using fibrous carbon nanostructures, it is also possible to produce carbon nanofibers in the
form of a non-woven sheet from the beginning.
05-05-2019
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[0031]
Wet sheet-forming using fibrous carbon nanostructures forms a non-woven fabric containing
fibrous carbon nanostructures on a porous body by filtering a solution in which the fibrous
carbon nanostructures are dispersed by a porous body, It can be set as the method of stripping
off the nonwoven fabric of a carbon nanotube from a porous body, and drying. The heating
element 2 having a desired three-dimensional shape can be obtained by selecting the surface
shape of the porous body for filtering the dispersion solution of the fibrous carbon
nanostructure.
[0032]
The solvent of the dispersion solution of the fibrous carbon nanostructure is water, for example,
alcohols such as methanol, ethanol, propanol, for example, ketones such as acetone, methyl ethyl
ketone, for example ethers such as tetrahydrofuran, dioxane, diglyme, for example N Amides
such as N, N-dimethylformamide, N, N-dimethylacetamide, N-methyl-2-pyrrolidone, and 1,3dimethyl-2 imidazolidinone, for example, sulfur-containing solvents such as dimethylsulfoxide
and sulfolane The species or two or more species can be used in combination.
[0033]
In addition to the binder, for example, a conductive auxiliary agent, a dispersing agent, a
surfactant and the like may be contained in the dispersion solution of the fibrous carbon
nanostructure.
A well-known thing can be used suitably as these.
[0034]
Rubber or resin latex can be used as the binder.
[0035]
The rubber latex is not particularly limited, and examples thereof include natural rubber latex,
synthetic diene rubber latex (butadiene rubber, styrene butadiene rubber, acrylonitrile butadiene
rubber, chloroprene rubber, latex such as butyl rubber), ethylene vinyl acetate rubber latex,
05-05-2019
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Examples include vinylpyridine rubber latex, fluororubber latex and the like.
[0036]
The latex of the resin is not particularly limited, and, for example, polyethylene, polypropylene,
styrene resin, acrylic resin, methacrylic resin, organic acid vinyl ester resin, vinyl ether resin,
halogen containing resin, olefin resin Examples thereof include latexes of alicyclic olefin resins,
polycarbonates, polyesters, polyamides, thermoplastic polyurethanes, polysulfones,
polyphenylene ethers, silicone resins and the like.
[0037]
As a method of obtaining carbon nanofibers in the form of non-woven sheet from the beginning,
first, an acrylic solution is blown from a nozzle by a direct current high-pressure current, and
fragmented into an acrylic nanofiber non-woven sheet consisting of fibers of nano level diameter.
Manufacture (electrospinning method).
Next, the acrylic nanofiber non-woven sheet is subjected to a flameproofing treatment by heating
at 220 ° C., for example.
Furthermore, the acrylic nanofiber non-woven sheet is heated at, for example, 1100 ° C. to
perform a carbonization and firing treatment (carbon nanofiberation).
Thereby, the carbon nanofiber nonwoven sheet which can be used as heating element 2 is
obtained.
[0038]
[Electrode] The electrode 3 is preferably laminated on both ends of the heating element 2 over
the entire width. As a result, the density of the current flowing in the heating element 2 can be
made uniform, and the generation of sound waves can be made more efficient and the durability
of the heating element can be improved.
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[0039]
The electrode 3 may be formed of a conductive paste or the like, or may be a rod-like or bandlike conductor connected to the heating element 2 by a conductive adhesive or the like.
[0040]
[Wiring] As the wiring 4, for example, a linear conductor such as a covered wire can be used, but
a conductor containing a fibrous nanocarbon structure such as a carbon nanotube may be used.
[0041]
[Signal Generator] The signal generator 5 generates a drive current that causes the heat
generating element 2 to generate heat, and supplies the drive current to the heat generating
element 2 through the wiring 4 (and the electrodes 3).
The drive current is selected according to the application of the thermoacoustic apparatus, and
may be a pulse current or a periodic current.
The voltage of the drive current can be, for example, 5 V or more and 100 V or less. The
waveform of the drive current may be, for example, a sine wave, a rectangular wave, a sawtooth
wave, or the like. The frequency when the drive current is periodic can be, for example, 1 kHz or
more and 20 MHz or less.
[0042]
[Fixing Member] As the fixing member 6, an adhesive can be used. When the base member 1 has
conductivity, the base member 1 and the heating element 2 may be insulated by using an
insulating adhesive as the fixing member 6, and at least one of the base member 1 and the
heating element 2 is insulated After providing the layer, it may be fixed using a conductive
adhesive. Further, as the fixing member 6, it is preferable to use an adhesive having high heat
resistance.
[0043]
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11
[Conductive Member] As the conductive member 7, for example, a conductive paste can be used.
In addition, when the electrode 3 is formed of a conductive paste, the conductive member 7 can
be omitted.
[0044]
[Advantage] In the thermoacoustic device, by using the heating element 2 formed from the nonwoven sheet containing the fibrous carbon nanostructure, the strength of the heating element 2
is relatively large, relatively easily and inexpensively It can be manufactured, and the output can
be increased and the device can be miniaturized.
[0045]
Second Embodiment FIG. 3 shows a thermoacoustic apparatus according to an embodiment
different from FIG. 1 of the present invention.
[0046]
The thermoacoustic device includes a rectangular frame-shaped base member 1, a plurality of
heating elements 2 a disposed in parallel between two sides on both sides in the longitudinal
direction of the base member 1, and the heating elements 2 a And a plurality of pairs of
electrodes 3a provided along both side edges in the longitudinal direction.
Furthermore, the thermoacoustic apparatus includes a wire 4 for applying a drive current
between the electrodes 3a at both ends of each heating element 2a, a conductive member 7, and
a signal generator (not shown).
[0047]
The said thermoacoustic apparatus can apply an electric current separately to several heat
generating body 2a from the signal generator via the wiring 4, and can generate an acoustic
wave independently to each heat generating body 2a.
[0048]
[Base Member] The configuration of the base member 1 in the thermoacoustic apparatus of FIG.
3 can be the same as the configuration of the base member 1 in the thermoacoustic apparatus of
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FIG. 1.
[0049]
Heating Element The heating element 2a is a strip formed of a non-woven sheet containing a
plurality of fibrous carbon nanostructures, and is stretched on the base member 1 in parallel at
equal intervals.
[0050]
The configuration of the heating element 2a in the thermoacoustic apparatus of FIG. 3 can be the
same as that of the heating element 2 in the thermoacoustic apparatus of FIG. 1 except that the
planar shape and the number are different.
[0051]
[Electrode] It is preferable that the electrode 3a be stacked on both ends of each heating element
2a over the entire width.
The configuration of the electrodes 3a in the thermoacoustic device of FIG. 3 can be the same as
the configuration of the electrodes 3 in the thermoacoustic device of FIG. 1 except that the
electrodes 3a are provided on the respective heating elements 2a.
[0052]
[Advantage] In the thermoacoustic device, each heating element 2a can individually generate an
acoustic wave by using a plurality of heating elements 2a formed from a non-woven sheet
containing a fibrous carbon nanostructure. .
Therefore, the thermoacoustic apparatus can be used as a transmission probe for an ultrasonic
flaw detector by the phased array method.
Specifically, by separately controlling the timing of energization of each heating element 2a, it is
possible to transmit a plurality of ultrasonic waves from each heating element 2a and form a
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single wavefront that runs in the intended direction.
[0053]
Third Embodiment FIG. 4 shows a thermoacoustic apparatus according to an embodiment
different from FIGS. 1 to 3 of the present invention.
[0054]
The thermoacoustic device includes a rectangular frame-shaped base member 1, a heating
element 2 b disposed so as to bridge between two sides of the base member 1 in the longitudinal
direction, and side edges of the heating element 2 b in the longitudinal direction And a plurality
of pairs of electrodes 3 provided along the
Further, the thermoacoustic apparatus includes a wire (not shown) for applying a drive current
between the electrodes 3 at both ends of the heat generating element 2b and a signal generator.
[0055]
[Base Member] The configuration of the base member 1 in the thermoacoustic apparatus of FIG.
4 can be the same as the configuration of the base member 1 in the thermoacoustic apparatus of
FIG. 1.
[0056]
Heating Element The heating element 2 b is formed of a non-woven sheet containing a plurality
of fibrous carbon nanostructures, and has a three-dimensional shape curved in an arc shape in a
sectional view so as to be recessed inside the base member 1.
[0057]
As a structure of the heat generating body 2b in the thermoacoustic apparatus of FIG. 4, it can be
made to be the same as the heat generating body 2 in the thermoacoustic apparatus of FIG. 1
except the point from which cross-sectional shape differs.
[0058]
[Electrode] The configuration of the electrode 3 in the thermoacoustic device of FIG. 4 can be the
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same as the configuration of the electrode 3 in the thermoacoustic device of FIG.
[0059]
[Advantage] In the thermoacoustic device, the heating element 2b can maintain the shape of the
cylindrical surface by using the plurality of heating elements 2b formed from the non-woven
sheet containing the fibrous carbon nanostructure. .
Thereby, the said acoustic device can make the sound wave which generate | occur | produces
from the heat generating body 2b converge on centerline vicinity of the cylindrical surface of the
heat generating body 2b.
For this reason, resolution can be greatly improved by using the thermoacoustic apparatus for a
transmission probe of an ultrasonic flaw detector.
[0060]
Fourth Embodiment FIG. 5 shows a thermoacoustic apparatus according to an embodiment
different from FIGS. 1 to 4 of the present invention.
[0061]
The thermoacoustic apparatus includes a rectangular frame-shaped base member 1, a heating
element 2 c disposed to extend between two sides of the base member 1 in the longitudinal
direction, and side edges of the heating element 2 c in the longitudinal direction And a plurality
of pairs of electrodes 3 provided along the
Furthermore, the thermoacoustic device includes a wire (not shown) for applying a drive current
between the electrodes 3 at both ends of the heat generating body 2c and a signal generator.
[0062]
[Base Member] The configuration of the base member 1 in the thermoacoustic apparatus of FIG.
5 can be the same as the configuration of the base member 1 in the thermoacoustic apparatus of
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FIG. 1.
[0063]
[Heat generation body] The heat generation body 2c is formed of a non-woven sheet containing a
plurality of fibrous carbon nanostructures, is curved in a substantially arc shape in a cross
sectional view so as to be recessed inside the base member 1, and has a finer waveform. It has a
three-dimensional shape that is periodically bent to have.
[0064]
As a structure of the heat generating body 2c in the thermoacoustic apparatus of FIG. 5, it can be
made to be the same as that of the heat generating body 2 in the thermoacoustic apparatus of
FIG. 1 except the point from which cross-sectional shape differs.
[0065]
[Electrode] The configuration of the electrode 3 in the thermoacoustic apparatus of FIG. 5 can be
the same as the configuration of the electrode 3 in the thermoacoustic apparatus of FIG. 1.
[0066]
[Advantage] The thermoacoustic device has a shape in which the heating element 2c has a
corrugated cylindrical shape by using a plurality of heating elements 2c formed from a nonwoven sheet containing a plurality of fibrous carbon nanostructures. Can be held.
Accordingly, the acoustic device can cause the sound wave generated from the heat generating
element 2c to converge near the center line of the cylindrical surface of the heat generating
element 2c, and the sound pressure of the sound wave generated due to the large area of the
heat generating element 2c. Is relatively large.
For this reason, the thermoacoustic device can be increased in output or miniaturized.
Moreover, by adopting the corrugated shape, deformation is prevented by enhancing the rigidity
of the non-woven sheet containing carbon nanotubes, and as a result, the position where the
sound waves converge and the sound pressure can be maintained.
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The rigidity can be further enhanced by adopting an egg pack shape or a waffle shape instead of
the corrugated shape.
[0067]
Fifth Embodiment FIGS. 6 and 7 show a thermoacoustic apparatus according to an embodiment
different from FIGS. 1 to 5 of the present invention.
[0068]
The thermoacoustic apparatus includes a circular frame-shaped base member 1 d, a substantially
spherical heating element 2 d whose outer periphery is held by the base member 1 d, and a first
electrode 8 provided along the outer edge of the heating element 2 d. A second electrode 9
concentric with the first electrode 8 provided on the back surface of the heat generating body 2
d and a third electrode 10 having an edge shape or a dot shape provided on a central portion in
plan view of the back surface of the heat generating body 2 d.
[0069]
Furthermore, the thermoacoustic device is not shown in the figure, which applies a drive current
independently between the first electrode 8 and the second electrode 9 of the heating element 2
d and between the second electrode 9 and the third electrode 10. And a signal generator.
The signal generator can be connected to, for example, the second electrode 9 ground, and can
separately control the magnitude of the current between the ground and the first electrode 8 and
the third electrode 10, and the timing of energization. can do.
[0070]
[Base Member] The configuration of the base member 1 d in the thermoacoustic apparatus of
FIG. 6 can be the same as the configuration of the base member 1 in the thermoacoustic
apparatus of FIG. 1 except for the planar shape.
[0071]
[Heat generation body] The heat generation body 2d is formed of a non-woven sheet containing a
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plurality of fibrous carbon nanostructures, is spherical so as to be recessed inside the base
member 1d, and the outer peripheral portion is supported by the base member 1d It has a threedimensional shape that has a planar flange shape.
[0072]
The configuration of the heating element 2d in the thermoacoustic apparatus of FIG. 6 can be the
same as that of the heating element 2 in the thermoacoustic apparatus of FIG. 1 except that the
shape is different.
[0073]
[Electrode] The configuration of the electrodes 6, 7 and 8 in the thermoacoustic apparatus of FIG.
6 may be the same as the configuration of the electrode 3 in the thermoacoustic apparatus of
FIG. 1 except that the shape and the arrangement position are different. it can.
[0074]
[Advantage] The thermoacoustic device can form the heating element 2d into a spherical shape
by using a plurality of heating elements 2d formed from a non-woven sheet containing a plurality
of fibrous carbon nanostructures It has become.
[0075]
The thermoacoustic device can cause the sound wave generated by the heat generating element
2 d to converge on the substantially central point of the spherical surface by forming the heat
generating element 2 d into a spherical shape as described above.
For this reason, resolution can be greatly improved by using the thermoacoustic apparatus for a
transmission probe of an ultrasonic flaw detector.
[0076]
Further, as shown in FIG. 7, in the thermoacoustic device, the heating element 2 d is substantially
between the portion between the first electrode 8 and the second electrode 9 and the portion
between the second electrode 9 and the third electrode 10. It has two heating elements.
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For this reason, a drive current can be separately applied to a portion between the first electrode
8 and the second electrode 9 and a portion between the second electrode 9 and the third
electrode 10 to generate an acoustic wave.
As described above, in the thermoacoustic apparatus, since the heat generating body 2 d is
substantially divided into two heat generating bodies, it is possible to increase the amount of
each conduction and to increase the sound pressure of the generated sound wave.
[0077]
Sixth Embodiment FIGS. 8 and 9 show a thermoacoustic apparatus according to an embodiment
different from FIGS. 1 to 7 of the present invention.
[0078]
The thermoacoustic apparatus includes a rectangular frame-shaped base member 1 and a
plurality of strip-like heat generating members 2 e bridged in parallel between two sides of the
base member 1 in the longitudinal direction, and the plurality of heat generating members 2 e in
series. To connect to each other, a plurality of intermediate electrodes 11 alternately connecting
the ends of two adjacent heating elements 2e, and a pair of external electrodes 12 provided at
the ends where the intermediate electrodes 11 of the heating elements 2e at both ends are not
disposed. And
Furthermore, the thermoacoustic apparatus includes a wire (not shown) for applying a drive
current between the pair of external electrodes 12 and a signal generator.
[0079]
[Base Member] The configuration of the base member 1 in the thermoacoustic apparatus of FIG.
8 can be the same as the configuration of the base member 1 in the thermoacoustic apparatus of
FIG. 1.
[0080]
[Heating Element] The plurality of heating elements 2 e are formed by bending a non-woven
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sheet containing a plurality of fibrous carbon nanostructures in a bellows shape, and are
supported on the base member 1 in parallel and at equal intervals.
[0081]
The configuration of the heating element 2e in the thermoacoustic apparatus of FIG. 8 can be the
same as that of the heating element 2 in the thermoacoustic apparatus of FIG. 1 except that it is
three-dimensionally formed and the number thereof is different.
[0082]
The heating element 2e is bent so as to form a mountain shape (V-shape) having a constant
height in cross section, and the sound pressure of the generated sound wave is increased by
increasing the area.
[0083]
It is preferable that the height of the mountain shape of the heating element 2e bent in this way
is smaller than the wavelength of the generated sound wave.
Thereby, it is possible to generate sound waves in phase.
[0084]
[Electrode] The intermediate electrode 11 and the external electrode 12 are preferably stacked
over the entire width at each end of each heating element 2e.
The material and the like of the intermediate electrode 11 and the external electrode 12 in the
thermoacoustic apparatus of FIG. 8 can be the same as the material and the like of the electrode
3 in the thermoacoustic apparatus of FIG. 1.
[0085]
[Advantage] Since the thermoacoustic apparatus includes the heating element 2e bent in a
bellows shape, it is possible to increase the output or reduce the size.
05-05-2019
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[0086]
Seventh Embodiment FIG. 10 shows a thermoacoustic apparatus according to an embodiment
different from FIGS. 1 to 9 of the present invention.
[0087]
The thermoacoustic apparatus comprises a rectangular frame-shaped base member 1 and a
plurality of strip-like heating elements 2f bridged in parallel between two sides of the base
member 1 in the longitudinal direction, and the plurality of heating elements 2f in series. To
connect to each other, a plurality of intermediate electrodes 11 alternately connecting the ends
of two adjacent heating elements 2f, and a pair of external electrodes 12 provided at the ends
where the intermediate electrodes 11 of the heating elements 2f at both ends are not disposed.
And
Furthermore, the thermoacoustic apparatus includes a wire (not shown) for applying a drive
current between the pair of external electrodes 12 and a signal generator.
[0088]
[Base Member] The configuration of the base member 1 in the thermoacoustic apparatus of FIG.
10 can be the same as the configuration of the base member 1 in the thermoacoustic apparatus
of FIG. 1.
[0089]
[Heating Element] The plurality of heating elements 2 f are supported on the base member 1 in
parallel and at equal intervals.
Each heating element 2 f is formed by bending a non-woven sheet containing a plurality of
fibrous carbon nanostructures into a rectangular wave shape in cross-sectional view.
[0090]
05-05-2019
21
The configuration of the heating element 2f in the thermoacoustic apparatus of FIG. 10 can be
the same as that of the heating element 2e in the thermoacoustic apparatus of FIG.
[0091]
[Electrode] The electrode 3 in the thermoacoustic device of FIG. 10 can be the same as the
electrode 3 in the thermoacoustic device of FIG.
[0092]
[Advantage] Since the thermoacoustic apparatus includes the heating element 2f which is bent in
a rectangular wave shape in cross section, the output can be increased or the size can be
reduced.
[0093]
Eighth Embodiment FIG. 11 shows a thermoacoustic apparatus according to an embodiment
different from FIGS. 1 to 10 of the present invention.
[0094]
The thermoacoustic apparatus includes a rectangular frame-shaped base member 1 and a
plurality of strip-like heat generating members 2g bridged in parallel between two sides of the
base member 1 in the longitudinal direction, and the plurality of heat generating members 2g in
series. To connect to each other, a plurality of intermediate electrodes 11 alternately connecting
the ends of two adjacent heating elements 2g, and a pair of external electrodes 12 provided at
the ends where the intermediate electrodes 11 of the heating elements 2g at both ends are not
disposed. And
Furthermore, the thermoacoustic device includes a wire (not shown) for applying a drive current
between the pair of external electrodes 12 and a signal generator, and a porous provided on the
back surface of the base member 1 (opposite to the heating element 2b). And a member 13.
[0095]
[Base Member] The configuration of the base member 1 in the thermoacoustic apparatus of FIG.
11 can be the same as the configuration of the base member 1 in the thermoacoustic apparatus
of FIG. 1.
05-05-2019
22
[0096]
[Heating Element] The plurality of heating elements 2g are supported on the base member 1 in
parallel and at equal intervals.
Each heating element 2g is formed by bending a non-woven sheet containing a plurality of
fibrous carbon nanostructures.
[0097]
The heat dissipating fin of the heat acoustic device of FIG. 11 is a heat dissipating fin by reducing
the length (width) of the top of the heat dissipating body 2 f in the heat acoustic device of FIG. 10
and increasing the length (width) of the bottom. It also has the role of
[0098]
By increasing the height from the bottom to the top (convex portion) of each heating element 2g
and keeping the distance between the top and the bottom of heating element 2g relatively large,
it is possible to It is preferable to improve the flow of air).
The flow velocity in the vicinity of the convex portion of each heating element 2g may be
increased using a fan, or a part of the convex portion of each heating element 2g may be cut to
form a columnar convex.
[0099]
[Electrode] The electrode 3 in the thermoacoustic device of FIG. 11 can be the same as the
electrode 3 in the thermoacoustic device of FIG.
[0100]
[Porous Member] The porous member 13 is connected to the base member 1 using an adhesive
05-05-2019
23
or the like (not shown).
For example, when the porous member 13 is used as a transmission probe for an ultrasonic flaw
detector, the background noise is reduced by absorbing sound waves generated from the back
surface of the heating element 2b by the porous member 13. As a result, S / S The N ratio can be
improved.
[0101]
[Advantage] Since the thermoacoustic apparatus includes the heating element 2g which is bent in
a rectangular wave shape in cross section and has a function of a radiation fin, it is possible to
increase the output or reduce the size.
In addition, since the thermoacoustic apparatus has the porous member 13 that absorbs
unnecessary sound waves from the back of the heating element 2g, ultrasonic flaw detection with
a high S / N ratio can be achieved by using it as a transmission probe for an ultrasonic flaw
detection apparatus. It becomes possible.
[0102]
Ninth Embodiment FIGS. 12 and 13 show a thermoacoustic apparatus according to an
embodiment different from FIGS. 1 to 11 of the present invention.
[0103]
The thermoacoustic apparatus includes a plurality of through electrodes 14a and 14b disposed
at portions where the plate-like base member 1h, the heating element 2h disposed on the surface
of the base member 1h, and the heating element 2h of the base member 1h are in contact. , 14c,
14d, 14e, 14f, 14g, 14h, 14i.
A hole 15 is formed in the base member 1 h.
Further, the thermoacoustic apparatus includes a wiring (not shown) for applying a drive current
05-05-2019
24
to the plurality of through electrodes 14a, 14b, 14c, 14d, 14e, 14f, 14g, 14h, and 14i, and a
signal generator.
[0104]
[Base Member] The base member 1h in the thermoacoustic apparatus of FIG. 12 is formed of an
insulating material, and the heat generating element 2h and the plurality of through electrodes
14a, 14b, 14c, 14d, 14e, 14f, 14g, 14h, 14i. Hold.
[0105]
The base member 1 h is formed in parallel at equal intervals, and has a plurality of slit-like holes
15 penetrating to the front and back.
[0106]
[Heat generation body] The plurality of heat generation bodies 2h are formed by bending a single
non-woven sheet containing a plurality of fibrous carbon nanostructures, and a plurality of
through electrodes 14a, 14b, disposed in the base member 1h. A plurality of bottoms 16
mounted on 14c, 14d, 14e, 14f, 14g, 14h, 14i, a plurality of walls 17 extending upward from the
bottoms 16, and a plurality of tops of adjacent walls 17 are connected And a top 18.
[0107]
The bottom 16 and the wall 17 are planar and the top 18 is convexly curved upward.
Further, the bending angle of the boundary between the bottom portion 16 and the wall portion
17 is larger than 90 degrees, and the bending angle of the boundary between the wall portion 17
and the top portion 18 is smaller than 90 degrees.
The boundary between wall 17 and top 18 may be rounded and curved.
Thereby, it is possible to reduce bending stress acting on the boundary between the wall portion
17 and the top portion 18 when the air in the space surrounded by the heating element 2 h and
the base member 1 h in a cross sectional view expands.
05-05-2019
25
[0108]
Further, the plurality of top portions 18 of the heat generating body 2 h are disposed above the
holes 15 of the base member 1 h, and the plurality of bottom portions 16 of the heat generating
body 2 h are arranged not to overlap the holes 15 of the base member 1 h .
Therefore, the space surrounded by the opposing wall 17 and the top 18 of the heating element
2 h in cross section communicates with the external space on the back surface side of the base
member 1 h through the hole 15.
Thereby, when the air in the space surrounded by the wall portion 17 and the top portion 18
expands, the thermoacoustic device can discharge part of the air in the space to the outside, so
the heat generating body 2h The stress applied to the heat sink can be reduced, and the heat
dissipation of the heating element 2h is excellent.
The hole 15 may be omitted to simplify the structure.
[0109]
[Electrode] Each of the through electrodes 14a, 14b, 14c, 14d, 14e, 14f, 14g, 14h, 14i is a bandshaped distribution portion 19 disposed on the surface of the base member 1h, and one or more
penetrating the base member 1h And a through portion 20 of
The distribution unit 19 may be, for example, a conductive adhesive or the like that fixes the
bottom portion 16 of the heating element 2 h to the base member 1 h and electrically connects
the bottom portion 16 and the through portion 20. It may have a strip-shaped conductor layer
and a conductive adhesive or the like for connecting the conductor layer and the bottom portion
16 of the heating element 2h.
[0110]
[Advantage] The thermoacoustic device bends a single non-woven sheet to form a plurality of
bottom portions 16, wall portions 17 and top portions 18 so that the sound waves of the heating
05-05-2019
26
element 2h can be compared to the area in plan view. Since the area to be generated is large, it is
possible to increase the output or reduce the size.
[0111]
Further, since the thermoacoustic device can be driven by dividing the heating element 2h into a
plurality of parts, it can be used as a transmission probe for an ultrasonic flaw detector by the
phased array method by sequentially driving these.
For example, by individually connecting the respective through electrodes 14a, 14c, 14e, 14g,
and 14i to grounds and separately controlling the timings of energization between these grounds
and the respective through electrodes 14b, 14d, 14f, and 14h, individual heat generation can be
performed. A plurality of ultrasonic waves can be emitted from the body 2h to form a single
wavefront that travels in the intended direction.
[0112]
Tenth Embodiment FIGS. 14 and 15 show a thermoacoustic apparatus according to an
embodiment different from FIGS. 1 to 13 of the present invention.
[0113]
The thermoacoustic device includes a plurality of through electrodes 14a and 14b disposed at
portions where the plate-like base member 1i, the heating element 2i disposed on the surface of
the base member 1i, and the heating element 2i of the base member 1i are in contact. , 14c, 14d,
14e, 14f, 14g, 14h, 14i.
Furthermore, the thermoacoustic apparatus includes a wire (not shown) for applying a drive
current between the pair of external electrodes 12 and a signal generator.
[0114]
[Base Member] The base member 1i in the thermoacoustic apparatus of FIG. 14 is formed of an
insulating material, and the heating element 2i and the plurality of through electrodes 14a, 14b,
14c, 14d, 14e, 14f, 14g, 14h, 14i. Hold.
05-05-2019
27
[0115]
[Heating Element] The plurality of heating elements 2i are formed by bending a single nonwoven sheet containing a plurality of carbon nanotubes, and a plurality of through electrodes
14a, 14b, 14c, 14d, and the like disposed on the base member 1i. 14e, 14f, 14g, 14h, 14i, a
plurality of bottoms 16 mounted on a plurality of walls 17 extending upward from the bottoms
16 and a plurality of tops 18 connecting upper ends of the adjacent walls 17; Have.
[0116]
The bottom 16 and the wall 17 are planar and the top 18 is convexly curved upward.
Further, the bending angle of the boundary between the bottom portion 16 and the wall portion
17 is larger than 90 degrees, and the bending angle of the boundary between the wall portion 17
and the top portion 18 is smaller than 90 degrees.
The boundary between wall 17 and top 18 may be rounded and curved.
Thereby, it is possible to reduce the bending stress acting on the boundary between the wall 17
and the top 18 when the air in the space surrounded by the heating element 2i and the base
member 1i in a cross sectional view expands.
[0117]
The heating element 2i has a plurality of vents 21 formed side by side on each top 18.
Thereby, the thermoacoustic device can discharge part of the air in the space to the outside when
the air in the space surrounded by the wall portion 17 and the top portion 18 expands, so the
heating element 2i The stress applied to the heat sink can be reduced, and the heat dissipation of
the heating element 2i is excellent.
05-05-2019
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[0118]
The vent holes 21 may be formed at both the top 18 and the wall 17 or at the wall 17 or at the
boundary between the top 18 and the wall 17 instead of providing the vent 21 at the top 18.
Further, the vent holes 21 may be omitted to simplify the structure.
[0119]
Eleventh Embodiment FIG. 16 shows the configuration of a sonography apparatus according to
an embodiment of the present invention.
[0120]
The said sonography apparatus is provided with the thermoacoustic apparatus 31 which is itself
another embodiment of this invention, and the acoustic wave receiving element 32, and the
cylindrical workpiece arrange | positioned between the thermoacoustic apparatus 31 and the
acoustic wave receiving element 32. It is an ultrasonic flaw inspection sound examination
apparatus which inspects the flaw of W by the ultrasonic wave which thermoacoustic apparatus
31 generates.
[0121]
Thermoacoustic Device The thermoacoustic device 31 includes a cylindrical base member 33, a
heating element 34 disposed inside the base member 33, and a plurality of fixing members 35
for connecting the base member 33 and the heating element 34. And a pair of through electrodes
36 connected to both ends of the heating element 34 through the base member 33, a wire (not
shown) for applying a drive current between the pair of through electrodes 36, and a signal
generator.
[0122]
<Base Member> The base member 33 is a structural material that is formed of a material having
insulating properties and rigidity, and supports the heating element 34.
In addition, in order to improve the heat dissipation from the heat generating body 34, a hole
05-05-2019
29
may be formed in the base member 33.
[0123]
<Heating Element> The heating element 34 is formed by bending a single non-woven sheet
containing a plurality of fibrous carbon nanostructures.
More specifically, the heat generating body 34 is attached to the inner peripheral surface of the
base member 33 using the fixing member 35, and has a plurality of strip-like bottoms 37
extending in the axial direction of the base member 33. A plurality of wall portions 38 extending
to the central axis side and a plurality of apexes 39 connecting the adjacent wall portions 38 and
facing the central axis of the base member 33 are provided.
In addition, in order to improve heat dissipation, a vent may be formed in the heating element
34.
[0124]
The configuration of the non-woven sheet forming the heating element 34 of the thermoacoustic
device 31 of FIG. 16 can be the same as the non-woven sheet forming the heating element 2 of
the thermoacoustic device of FIG. 1.
[0125]
<Penetration electrode> In the said thermoacoustic apparatus 31, although a pair of penetration
electrode 36 is electrically connected to the both ends of the heat generating body 34, several
penetration electrodes 36 electrically connect to each bottom part 37 of the heat generating
body 34. By being connected and alternately connected to each other, current may be applied
independently between the bottoms 37 of the heating elements 34.
[0126]
[Sound Wave Receiving Element] The sound wave receiving element 32 has a plurality of sensors
that receive the sound wave generated by the thermoacoustic apparatus 31 and passed through
the workpiece W and convert it into an electric signal.
05-05-2019
30
[0127]
[Advantage] Since the ultrasonic inspection apparatus includes the thermoacoustic apparatus 31
having the heating element 34 formed by bending the non-woven sheet containing the fibrous
carbon nanostructure, and efficiently generating the sound wave, the inside of the work W
Defects such as scratches and air bubbles can be detected relatively accurately.
[0128]
Twelfth Embodiment FIG. 17 shows the configuration of a sonic inspection apparatus according
to an embodiment different from FIG. 16 of the present invention.
[0129]
The sonic inspection apparatus itself comprises a thermoacoustic apparatus 31a according to
another embodiment of the present invention, and an acoustic wave receiving element 32a, and
has a rectangular cylindrical shape disposed between the thermoacoustic apparatus 31a and the
acoustic wave receiving element 32a. It is an ultrasonic flaw inspection sound examination
apparatus which inspects a wound of work Wa by ultrasonic waves which thermoacoustic
apparatus 31a generates.
[0130]
[Thermoacoustic Device] The thermoacoustic device 31a is a rectangular cylindrical base
member 33a, a heating element 34a disposed outside the base member 33a, and a plurality of
fixing members for connecting the base member 33a and the heating element 34a. 35a, a pair of
through electrodes 36a disposed between the base member 33a and the heating element 34a, a
wire (not shown) for applying a drive current between the pair of through electrodes 36a, and a
signal generator.
[0131]
<Base Member> The base member 33a is a structural material that is formed of a material having
insulating properties and rigidity, and supports the heating element 34a.
In addition, in order to improve heat dissipation, a hole may be formed in the base member 33a.
[0132]
05-05-2019
31
Heating Element The heating element 34a is formed by bending a single non-woven sheet
containing a plurality of fibrous carbon nanostructures.
More specifically, the heat generating body 34a is attached to the outer peripheral surface of the
base member 33a and is adjacent to a plurality of strip-like bottoms 37a extending in the axial
direction of the base member 33a and a plurality of walls 38a extending outward from the
bottom 37a. And a plurality of top portions 39a connecting between the wall portions 38a.
In order to improve the heat dissipation, a vent may be formed in the heating element 34a.
[0133]
The configuration of the non-woven sheet forming the heating element 34a of the
thermoacoustic device 31a of FIG. 17 can be the same as the non-woven sheet forming the
heating element 2 of the thermoacoustic device of FIG.
[0134]
<Penetration electrode> Although the pair of penetration electrodes 36a are electrically
connected to both ends of the heat generating body 34a in the thermoacoustic device 31a, the
plurality of through electrodes 36a are electrically connected to the bottoms 37a of the heat
generating body 34a. By being connected and alternately connected to each other, current may
be applied independently between the bottoms 37a of the heating elements 34a.
[0135]
[Sound Wave Receiving Element] The sound wave receiving element 32a includes a plurality of
sensors that generate the thermoacoustic device 31a and receive the sound wave that has passed
through the work Wa and convert the sound wave into an electric signal.
[0136]
[Advantage] Since the ultrasonic inspection apparatus includes the thermoacoustic apparatus 31a
which has the heating element 34a formed by bending the non-woven sheet containing the
fibrous carbon nanostructure, and efficiently generates the sound wave, the inside of the work
Wa Defects such as scratches and air bubbles can be detected relatively accurately.
05-05-2019
32
[0137]
Thirteenth Embodiment FIG. 18 shows the configuration of a sonic inspection apparatus
according to an embodiment different from FIGS. 16 and 17 of the present invention.
[0138]
The sonic inspection apparatus is provided with a thermoacoustic apparatus 31b itself which is
another embodiment of the present invention, and a sonic wave receiving element 32b, and is a
cylindrical work disposed between the thermoacoustic apparatus 31b and the sonic wave
receiving element 32b. It is an ultrasonic flaw inspection sound examination apparatus which
inspects the wound of Wb with the ultrasonic wave which thermoacoustic apparatus 31b
generates.
[0139]
Thermoacoustic Device The thermoacoustic device 31 b includes a cylindrical heating device 40,
a heating element 34 b disposed inside the heating device 40, wiring (not shown) for applying a
driving current to the heating device 40, and signal generation. And the
[0140]
<Heating Device> The heating device 40 can heat the heating element 34 b disposed inside the
heating device 40 without contact.
As the heating device 40, for example, light energy generating means such as a lamp or a laser is
provided, and light energy from this light energy generating means is irradiated to the heating
element 2 to scan the entire surface of the heating element 34b or scan a part. (Scan) heat.
[0141]
As the heating device 40, instead of using the light energy generating means, an electromagnetic
wave generating means such as an IH coil for induction heating the heating element 34b by
irradiating the heating element 34b with an electromagnetic wave or a magnetron for microwave
heating may be used.
[0142]
05-05-2019
33
<Heating Element> The heating element 34b is formed by bending a single non-woven sheet
containing a plurality of fibrous carbon nanostructures into a cylindrical shape and joining both
ends of the heating element 34b with a conductive member (not shown) or the like. Be done.
In order to bend the heat generating body 34b to increase the surface area, to fluff the surface
irradiated with light, or to improve the heat dissipation, a hole may be formed in the heat
generating body 34b.
[0143]
When heating the heating element 34b using an electromagnetic wave generating means such as
a magnetron, the heating element 34b preferably contains a carbon nanocoil or a carbon
microcoil as a fibrous carbon nanostructure.
[0144]
The configuration of the non-woven sheet forming the heating element 34b of the
thermoacoustic device 31b of FIG. 18 can be the same as the non-woven sheet forming the
heating element 34b of the thermoacoustic device of FIG.
[0145]
[Sound Wave Receiving Element] The sound wave receiving element 32a includes a plurality of
sensors that generate the thermoacoustic device 31a and receive the sound wave that has passed
through the work Wa and convert the sound wave into an electric signal.
[0146]
[Advantages] In these non-contact heating methods, the wiring, electrodes and junctions in the
heating element 34b become unnecessary, so the structure of the thermoacoustic device 31b can
be simplified, reduced in weight, reduced in size, and arrayed (multipixel). It becomes easy.
In the case of moving and using the periphery of a work as a transmission probe for an ultrasonic
flaw detector, there is a problem that the wiring is easily broken. In particular, when the probe is
driven at high speed, the risk of the breakage increases.
05-05-2019
34
To solve this problem, the heating device 40 is fixedly arranged, and by scanning the optical
system, the necessary sound pressure ultrasonic waves can be generated without a cable from
any place of the heating element 34b. While the risk of disconnection can be greatly reduced,
speeding up of inspection becomes easy.
The heating element 34b may be disposed movably.
[0147]
[Other Embodiments] The above embodiments do not limit the configuration of the present
invention.
Therefore, the embodiment can omit, substitute, or add the components of each part of the
embodiment based on the description of the present specification and common technical
knowledge, and all of them can be construed as belonging to the scope of the present invention.
It should.
[0148]
In the thermoacoustic device, the three-dimensional shape of the heating element may be formed
by paper-making.
[0149]
The said sonic inspection apparatus is not restricted to what test | inspects a cylindrical
workpiece | work.
Further, the thermoacoustic apparatus may be formed by combining the thermoacoustic
apparatus and the acoustic wave detecting element as in the above-described first to tenth
embodiments, for example. The thermoacoustic apparatus and the acoustic wave receiving
element It may be a scanning device that moves any of the above.
05-05-2019
35
[0150]
The thermoacoustic apparatus according to the present invention can be particularly suitably
used for an ultrasonic flaw detection sonic inspection apparatus.
[0151]
1, 1d, 1h, 1i, 33, 33a Base members 2, 2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h, 2i, 34, 34a, 34b Heating
element 3, 3a electrode 4 Wiring 5 Signal generator 6, 35, 35a Fixing member 7 Conductive
member 8 First electrode 9 Second electrode 10 Third electrode 11 Intermediate electrode 12
External electrode 13 Porous member 14a, 14b, 14c, 14d, 14e, 14f, 14g, 14h, 14i, 36, 36a
through electrode 15 hole portion 16, 37, 37a bottom portion 17, 38, 38a wall portion 18, 39,
39a top portion 19 distributing portion 20 penetrating portion 21 vent hole 31, 31a, 31b
thermoacoustic device 32, 32a, 32b sound wave Receiver 40 Heating device W, Wa, Wb
Workpiece
05-05-2019
36
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