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JPS5784350

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DESCRIPTION JPS5784350
Description of the Invention In the electromagnetic ultrasonic probe consisting of an
electromagnetic ultrasonic probe 1, a DC electromagnet and an ultrasonic transmitting and
receiving coil, the transmitting and receiving coil is formed by winding a conductor wire.
Electromagnetic ultrasound probe.
Claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the following
electromagnetic ultrasonic probe for use in an ultrasonic measurement system that generates or
detects ultrasonic waves by an electromagnetic method. Conventionally, an ultrasonic thickness
gauge, a flaw detector, etc. are used for thickness measurement of materials and products, and
measurement of flaw detection tubes. Such devices require a medium (usually water) between the
probe and the test material in order for the ultrasound to reach the test material. For this reason,
it is difficult to measure a high-bulk material or a material having a scale or surface roughness.
For this reason, it is strongly required to transmit and receive ultrasonic waves without being
affected by the temperature or surface condition of the test material. Japanese Patent Publication
No. 44-24867 is proposed as a method to satisfy such a demand. Japanese Patent Publication
No. 44-24867 is an apparatus for transmitting and receiving ultrasonic waves by an
electromagnetic method and is hereinafter referred to as a C or less electromagnetic ultrasonic
flaw detector. The structure of the probe of the electromagnetic ultrasonic flaw detector is
generally such that the iron core of the electromagnet has an E-shaped cross section and an
ultrasonic transmitting / receiving coil is provided under the central sulfuric acid 4. An example
will be described with reference to FIGS. 1 and 2. In addition, the test material 1 is abbreviate |
omitted in FIG. In the figure, a DC electromagnet consisting of a DC excitation coil 2 and an iron
core 3 with an E-shaped cross section is disposed on the test material 1, and the central leg jK of
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the iron core 3 is wound with an insulating copper wire etc. In order to protect the sound wave
receiving coil 5 and the coil 5, a non-conductive protective note 6 and a case 7 made of acrylic
are attached. In the above configuration, the DC excitation coil 2 is excited by a DC power supply
(not shown) to apply a DC magnetic field to the test material 1, EndPage: 1 Next, pulse ionization
is applied to the transmission / reception coil 5 from a generator (not shown) Then, a changing
magnetic flux is generated, and the changing magnetic flux generates an eddy current 8 in the
test material 1. The eddy current Ie and the magnetic flux density B of the DC magnetic field
given in advance interact with each other (Fleming's law) to generate a deformation distortion U
represented by the equation (1). U-1,-B (1) Changed strain propagates in the test material as
ultrasonic waves, and defects in the test material and reflected ultrasonic waves from the bottom
surface are the reverse of those described above. The transmission / reception coil 5 is detected
by the process. The reception signal level VR of the detected ultrasonic wave is represented by
the equation (2), and VR ′ ′ U -B (2) (1), (2) from the equation (3) It becomes a formula.
Vn′′B ′ · I, −− (3), that is, reception of electromagnetic ultrasonic waves, · · · The thing that
most affects the signal level is the direct current magnetic flux density B generated from the
direct current electromagnet. The received signal level of the electromagnetic ultrasonic wave is
approximately 1/100 B degree of the signal level of the conventional ultrasonic flaw detector.
The low received signal level is the greatest impediment to the practical application of the
electromagnetic ultrasonic flaw detector, and the improvement of the received signal level is the
greatest problem of the electromagnetic ultrasonic flaw detector. For the reception signal level, it
is necessary to increase the direct current magnetic flux density B as is clear from the equation
(3). However, in the configuration of the conventional electromagnetic ultrasonic flaw detector as
shown in FIG. Since the protective sheet 6 and the case 7 are made of nonmagnetic material, the
magnetic resistance is large, and the amount of excitation of the DC coil 2 is increased to
generate the necessary magnetic flux density, large power consumption and large size of the
probe Has the disadvantage of The present invention has been made to eliminate the
disadvantages of the prior art as described above, and it is an object of the present invention to
provide an electromagnetic ultrasonic probe capable of greatly improving the reception signal
level of electromagnetic ultrasonic waves. The feature of the present invention is that the
transmitting and receiving coil is formed by winding a wire of a magnetic material of a conductor
so as to increase the generation of the magnetic flux density variation. FIG. 3 shows an
embodiment of the present invention. 3 differs from FIG. 1 in the central leg 4 of the D.C.
electromagnet core 3 having an E-shaped cross section, and an ultrasonic receiving coil 8 in
which an insulated wire (for example, iron wire) made of a high permeability material is wound a
required number of times. It is what it provided. In the electromagnetic ultrasonic probe of this
configuration, since the transmitting and receiving coil 8 is a high permeability material, the
magnetic resistance is significantly reduced. For this reason, since the generated DC magnetic
flux density 1iB increases, the reception signal level V also increases. That is, in the conventional
case (FIG. 1), the nonmagnetic material in the magnetic circuit is about 0.6 mm of the
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transmitting and receiving coil plus protection sheet 6 and protection case 7 of about 0.. ? In the
case of the present invention (FIG. 3), the transmission and reception coil 8 is a magnetic
material, but it decreases by 0.9 trtrnK in the case of the present invention (FIG. 3). Accordingly,
the reluctance is reduced to 60, the DC magnetic flux is generated 1.67 times, and the reception
signal level of the ultrasonic wave is approximately 28 times according to the equation (3). As
described above, according to the present invention, the reception signal level of electromagnetic
ultrasonic waves can be greatly increased. Of course, the present invention can be similarly
carried out not only with the above-described E-shaped cross-section iron core probe but also
with a U-shaped iron core probe as shown in FIG.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an example of an
electromagnetic ultrasonic probe, FIG. 2 is a bottom view thereof, FIG. 3 is a sectional view
showing one embodiment of the present invention, and FIG. FIG. 7 is a non-sectional view of
another embodiment of the present invention. ■ · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · send / receive coil
(nonmagnetic) 1, attorney patent attorney Akio Takahashi EndPage: 2 囚 1 囚! Fig. 2 ¥ 53 Fig.
Doogi EndPage: 3
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