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JPS63185300

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DESCRIPTION JPS63185300
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
fiber optic hydrophones, and more particularly to fiber optic hydrophones that can be used
under high water pressure. 2. Description of the Related Art An example of prior art of an optical
fiber hydrophone will be described with reference to the drawings. FIG. 6 (a) is an external view
showing an example of a structure according to the prior art, and FIG. 6 (b) is a cross-sectional
view showing the structure cut along line X-Y of FIG. 6 (a). Diaphragm 42 is formed on both flat
surfaces of flat support framework 41 by bonding, mounting or the like. Also, there are two
curved side portions 45 that smoothly connect the surfaces of the diaphragm 42 attached to
both sides. Further, the thickness of the wall of the support framework 41 is sufficiently thicker
than the thickness of the diaphragm 42, and there is a space inside, and the support framework
further includes an optical fiber 43 (particularly, polarization maintaining optical fiber) The
portion 45 and the diaphragm 42 are in close contact with each other and wound, and the
portion in contact with the diaphragm 42 is solidified with a care agent (for example, epoxy yarn
synthetic resin). Also, when receiving hydrophone or sound v-, the hydrophone feels pressure
when the dog's height of the hydrophone is sufficiently small compared to the synthetic
wavelength! It becomes 4 IJ type, and two diaphragms are simultaneously pulled inside or
outside of the support framework. Therefore, as shown in FIG. 4 (a) ', the two fibers attached to
the support framework IA or the outward expansion of the support framework IA, and the
original fiber 31A fixed to the two diaphragms is pulled outward. Being, that cross section & I!
The stress acts in the diametrical direction parallel to the JjJ plate. As shown in FIG. 4 (b), the
diaphragm 2B attached to the support framework IBK is recessed inward of the support
framework IB, and the optical fiber 31B fixed to the two vibration members is compressed
inward and its Pgr The compressive stress acts in the diametrical direction parallel to the
diaphragm of the surface. On the other hand, an ordinary optical fiber has a core at its center,
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and has a structure having a cross section concentric with the core surrounded by a cladding
whose refractive index is smaller than that of its surrounding t core. However, in order to
preserve the entire polarization plane of the optical fiber, consideration can be given to the
arrangement of the core and the cladding. That is, as shown in FIG. 5 (a), the cross section of the
optical fiber is a so-called elliptical clad type in which the elliptical clad is arranged around the
core 4o and filled with the entire support 42 around it, The oval core type which is completely
inverted, and so-called panda provided with two stress applying portions 46A and 46B of the
same size on both sides of the core 45 as seen in FIG. 5 (b) There is a type.
In addition, when an external force is applied to an optical fiber having such a structure, and
when it is applied to a bend or a stress', rotation of the polarization plane is observed. From nK to
i7 Iber, the polarization force is rotated through the change of d-force external force and its
rotation! The pressure applied to the diaphragm, that is, the sound pressure can be measured by
detecting it through the entire analyzer or the like. However, since there is a space inside the
support framework 41 and a part of the space is configured to be in contact with the outer
surface with a thin plate thickness, it can not withstand the external pressure of the dog and
therefore the water depth is shallow. It is possible to use J + UO) in the shallow sea. [Problems to
be Solved by the Invention] The problems of the prior art to be solved by the present invention
are, as mentioned above, an internal structure surrounded by a support framework and a
diaphragm which are constituted by an optical fiber hydrophone. Because there is space, it can
not withstand large external pressure, and it can not be used in deep seas (a pressure of about
100 k, a pressure of about 100 k occurs at a depth of 1000 m). Accordingly, it is an object of the
present invention to provide an optical fiber toyrophone which can be used under the high water
pressure of the Green Sea which solves all the above problems. [Means for solving all the
problems] The optical fiber hydrophone of the present invention forms diaphragms on both flat
sides of a flat support framework, and connects the surfaces of both sides wj temporary with
smooth curved surfaces. In an optical fiber hydrophone having at least two side portions and in
which an optical fiber is closely wound through the curved surface and fixed to the diaphragm,
an adhesive made of an elastic body in which all air bubbles are interspersed between the
diaphragms. A body is inserted, and a sound tube and a liquid are filled in a space surrounded by
the support framework and the diaphragm, and an acoustic tube passing through the support
framework is made to sound. EXAMPLE Next, an example of the present invention? This will be
described in detail with reference to all the drawings shown. FIG. 1 is an external view showing
the structure of an embodiment of the present invention, FIG. 2 (a) is a cross-sectional view
showing the structure of FIG. 1 cut by X-Y, FIG. FIG. 3 is a block diagram showing the
constitution of a measuring system using the present invention. First, an outline of the present
invention will be described. In order to construct an optical fiber hydrophone for high water
pressure, which is an object of the present invention, there is a need for providing high water
pressure resistance gold in an internal space consisting of a support framework of the optical
fiber hydrophone and a diaphragm. For example, the internal space may be filled with a liquid
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such as oil to make it internal and external, and the volume fluctuation due to the pressure and
movement of the liquid may be divided by a movable thin rubber group or the like.
Also, when viewed from the diaphragm, the same pressure is applied from the diaphragms on
both sides, so there is a liquid between the diaphragms, and the movement of the diaphragm is
restricted. Therefore, according to this method, the high hydraulic resistance of the optical fiber
hydrophone itself can be obtained, but the sensitivity is extremely lowered. Therefore, it is
conceivable to place an air plating inside the support framework. However, in the case of a glass
ball filled with bubbled epoxy resin, the wall of the glass ball does not elastically deform when an
alternating pressure such as a sound wave is applied, so that the bubble does not play a role.
Therefore, it is necessary to make the boundary between the air bubble and the other object in
contact with the air bubble ready. Gas-filled elongated fibrous cell-rich onion skin vapor gold as
needed & increased, coated with rubber sheet or epoxy resin etc., this purpose can be satisfied
and gas entered against external pressure Part is hard to collapse. Therefore, it is possible to
maintain the effect of preventing the load from preventing the vibration of the diaphragm under
high pressure, that is, the sound insulation effect. The construction and operation of one
embodiment of the present invention will now be described. Referring to FIG. 1, this embodiment
comprises a support framework 1, a diaphragm 2, an optical fiber 3, an acoustic tube 4 and a
sound insulator 6. Diaphragm 2 is formed on both flat surfaces of flat support framework 1 by
bonding, mounting or the like. In addition, curved support side surfaces 5 smoothly connected to
the surfaces of the diaphragm 2 mounted on both sides are provided at two positions of the
support framework 1. Further, the wall of the support framework 1 is configured to be
sufficiently thicker than the thickness of the diaphragm 2, and an acoustic pipe 4 is provided
which penetrates the support framework 1 and has a use frequency in the attenuation region. In
the portion opened to the outside of the acoustic tube 4, a thin film or the like for preventing
passage of liquid inside and outside due to rubber or the like is stretched. Further, in the
supporting framework 1, the polarization maintaining optical fiber 3 is closely wound while
being in contact with the side portion 5 and the diaphragm 2 described above, and at least a
portion in contact with the diaphragm 2 is made of epoxy synthetic resin. It adheres with an
adhesive. The internal configuration of the support framework 1 and the operation and
measurement system of the entire transport will be described below. Next, the sound insulator 6
located inside the support framework 1 which is the center of the present invention, the
configuration related to this, and the operation will be described. As shown in FIGS. 2 (a) and 2
(b), in the internal space surrounded by the support framework 1 and the diaphragm 2, gas-filled
elongated filamentous cells (the vascular bundle seems to be broken in places) Of the onion skin
vapor 8 including the above, and coated and laminated with a press sheet, a rubber sheet, or a
coating material 1o such as an epoxy resin, and the sound insulator 6 is wrapped and fixed to the
support framework l. For this purpose, a projection IA is provided and fixed.
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The remaining part of the internal space is filled with a liquid 15 such as an oil (91 'for example,
a transformer oil) having a large difference from the reflection effect of water 1). Two sound
insulations may be made, and a method of pressing them on the diaphragm 2 may be adopted.
And Figure 2 (C)? As seen from c, as another example of the sound insulator 6, a synthetic rubber
or synthetic resin may be used as the coating material, and the air bubbles 9 may be completely
dispersed therein (without using a glass ball). Although the diameter of the air bubbles in any of
the above two examples is reduced by pressure even under high water pressure, they can contain
air bubbles sufficient for sound insulation, so that good sound insulation properties should be
maintained under high water pressure. Is possible. Next, the measurement system using the
optical fiber hydrophone 21 of the present invention will be described. Referring to FIG. 3, the
light source 11 emits a single-wavelength coherent light (so-called laser light). The laser beam
emits parallel light lfM by lens 13A, is polarized in a predetermined direction (angle of 114745
degrees between the X axis of the optical fiber and Ytm) by polarizer 12, and is converged again
by lens 13B. The optical fiber 14A is input to the optical fiber hydrobond 21 by J. When an
acoustic wave is present around the optical fiber, the pressure changes the polarization state at
the output end of the optical fiber, but the direction determined in advance by the analyzer 17
(generally the same as the polarization angle of the polarizer In the structure of passing only the
polarization component of the direction), focusing with the lens 18 B and detecting with the
photodiode 19, the light 7 outputs a signal corresponding to the intensity of the sound wave
applied to the Iber hydrophone 21. It is output as a signal 22. By the method as described above,
it is possible to measure sound pressure in the deep sea using the optical fiber no idrophone of
the present invention. [Effects of the Invention] As described above in detail, the optical fiber
hydrophone of the present invention is an elastic body in which all the air bubbles are
interspersed inside the diaphragm of the optical fiber hydrophone, such as laminated onion skin
peony rubber mat matata Since it is possible to provide a sound insulator coated with an epoxy
resin or the like, or a sound insulator made by scattering all bubbles in a synthetic rubber / sweet
acid resin, etc., there is an effect that it can be used in deep sea where large external pressure is
applied.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is an external view showing the structure of one embodiment of the present invention, FIG.
2 (a) is a cross-sectional view showing the structure cut by XY in FIG. 1, FIG. 2 (b) Fig. 3 is an
explanatory view showing an example of the structure of the body, Fig. 3 is a block diagram
showing the entire configuration of the measurement system used in the present invention, and
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Figs. 4 (a) and 4 (b) are optical fibers at the time of vibration of the diaphragm. FIG. 5 (a) and FIG.
5 (b) are sectional views showing an example of the structure of a polarization maintaining
optical fiber, and FIG. 6 (a) is an external view showing an example of the structure according to
the prior art. 6 (b) is a cross-sectional view showing a structure cut by XY in FIG. 6 (a).
DESCRIPTION OF SYMBOLS 1 ..... Supporting framework, 2 ..... Vibrating plate, 3 ..... Optical fiber,
4 °°°°° Sound writing tube, 5 .... Side part, 6 ... ... sound insulation.
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