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JPS60180400

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DESCRIPTION JPS60180400
[0001]
The present invention relates to an acoustic transducer using an optical fiber. Conventionally,
many piezoelectric transducers capable of directly converting sound pressure into electrical
signals have been developed and used as underwater acoustic transducers. In addition, since the
conversion efficiency of the piezoelectric transducer becomes low at an acoustic frequency ratio
of several hundreds Hz or less, in recent years, an acoustic transducer using an optical fiber has
been prototyped and evaluated. As shown in FIG. 1, an acoustic transducer using a general
optical fiber is provided with a tensile force by attaching an optical fiber 3 to a pressure receiving
plate l supported by a pressure receiving plate support 9. As shown in FIG. 2, a sawtooth
pressure receiving plate 1 applies bending force directly to the optical fiber 3 and detects the
phase change of the laser beam passing through the inside of the optical fiber. A measuring
method is used. However, the phase response of the optical fiber to temperature change is
considerably larger than that to the sound pressure, and the structure with the optical fiber
directly attached to the pressure receiving plate has a large effect due to the temperature change
and can sufficiently exhibit performance for sound pressure detection. It was not. Therefore, in
order to use for sound pressure detection, it is necessary to minimize the influence on
temperature. Also, the water pressure resistant structure has many structures with water
pressure resistance due to the thickness of the pressure receiving plate, and the thickness of the
pressure receiving plate becomes thick when it is for high water pressure, making it difficult to
deflect against slight sound pressure and saw teeth as shown in FIG. In the case of the pressurereceiving plate structure, there is a disadvantage that the phase characteristic is deteriorated
with respect to the p noise pressure due to the contact variation of the fibers. In order to solve
the above-mentioned drawbacks, the present invention is to wrap an optical fiber around a
cylindrical or cylindrical elastic body outer peripheral surface of a heat insulating material or a
circular cylindrical or cylindrical elastic body outer peripheral surface through a heat insulating
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1
material. The present invention provides an acoustic transducer with improved temperature
characteristics and water pressure resistance characteristics of the underwater acoustic
transducer using the above. That is, according to the present invention, an optical fiber is wound
around a cylindrical or cylindrical elastic body outer peripheral surface of a heat insulating
material or a cylindrical or cylindrical elastic body outer peripheral surface through a heat
insulating material, and the sound pressure is received from the front of the elastic body. It is a
low frequency underwater acoustic transducer that has a water pressure resistance that is less
affected by temperature changes by generating strain and detecting the amount of phase change
of the optical fiber due to the strain stress. Next, the principle of an acoustic transducer
according to an embodiment of the present invention will be described with reference to the
drawings. FIG. 3 is a principle view of an acoustic transducer according to the present invention.
This transducer has a small weight and high rigidity for receiving sound pressure, and a
pressure-sensitive plate 1 that amplifies the pressure due to the sound pressure and has a
smaller pressure receiving area than the pressure-receiving plate 1 to achieve a smaller size. And
the elastic body 2 with a large Poisson's ratio is provided.
The optical fiber 3 is wound around and fixed to the outer peripheral surface of the elastic body
2. The water pressure received by the pressure receiving plate 1 is structured to be received by
the housing 4, and the sound pressure received by the pressure receiving plate 1 is amplified by
the elastic body 2 and transmitted. The phase characteristics of the optical fiber with respect to
the sound pressure can be adjusted as necessary because it varies depending on the radial
direction of the resin material, the number of windings of the optical fiber, and the length. FIG. 4
is an acoustic transducer to which FIG. 3 is applied. The pressure receiving plate 1 is adhered to
the acoustic rubber 5 whose acoustic impedance is close to water. Bolt 6 lightly squeezes
pressure receiving plate 1, resin material 2 and case 4 and heat resistance is the thickest path,
acoustic rubber 5 ? pressure receiving plate 1 ? resin material 2 strength against pressure The
excellent thermal insulation 7 is inserted. Also, heat transfer from the case is air or vacuum 8 to
reduce the influence of temperature change. As a result, it is possible to realize an optical fiber
acoustic transducer excellent in water pressure resistance characteristics and excellent in
temperature characteristics. The above description is given for a transducer containing a single
sensor, but a large number of sensors arranged in a large number and a number of windings of
an optical fiber changed are wound around the same resin material l Terminal fiber optic
transceivers are also acceptable. Further, by using the heat insulating material 7, the elastic body
2 can be used with priority given to a material having an excellent Poisson's ratio. As described
above, the present invention is an acoustic transducer in which an optical fiber is wound around
a cylindrical or cylindrical elastic body outer peripheral surface of a heat insulating material or a
circular cylindrical or cylindrical elastic body outer peripheral surface through a heat insulating
material. As a low frequency acoustic transducer using a fiber, it is excellent in warmth
characteristics and excellent in water resistance characteristics.
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2
[0002]
Brief description of the drawings
[0003]
1 and 2 are diagrams for explaining the principle of the conventional optical fiber acoustic
converter, FIG. 3 is a diagram for explaining the present invention in detail, and FIG. 4 is a light
to which FIG. 3 is applied. It is a fiber acoustic transducer.
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portion.
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