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Diaphragm-free interference type optical fiber acoustic sensor probe and optical fiber acoustic sensor

A sensor probe, interference type technology, applied in the field of acoustic sensing, can solve the problems of small upper limit of dynamic range, large influence of optical path temperature, poor stability, etc., and achieve the effect of improving the ability to resist temperature changes, small size and low cost

Active Publication Date: 2022-03-01
BEIJING INFORMATION SCI & TECH UNIV
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Problems solved by technology

[0003] Most of the existing interferometric fiber optic acoustic sensors are based on the diaphragm structure, usually the upper limit of the dynamic range is small, and at the same time, the optical path of the interferometric structure is greatly affected by the temperature and the stability is poor

Method used

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  • Diaphragm-free interference type optical fiber acoustic sensor probe and optical fiber acoustic sensor

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Embodiment Construction

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0034] Fiber optic acoustic sensors can be divided into intensity type, phase type, wavelength type, etc. according to the different modulation optical parameters. The structure, the Sagnac interference structure, and the wavelength type are mainly based on the grating structure.

[0035] These different types of fiber optic acoustic sensors have their own characteristics. The principle of the intensity type is simple, but it is greatly affected by the flu...

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Abstract

The invention relates to a diaphragm-free interference type optical fiber acoustic sensor probe which comprises a shell with a hollow structure, and a cover plate is arranged above the shell; the reflecting piece is arranged on the lower surface of the cover piece, the reflecting piece is divided into a first reflecting part and a second reflecting part along the symmetry axis of the shell, and due to the fact that the thicknesses of the first reflecting part and the second reflecting part are different, a step is formed; the optical fiber fixing structure has a hollow cylindrical structure, the outer side surface of the optical fiber fixing structure is provided with threads, and the optical fiber fixing structure is fixed at the lower part of the shell through the threads; and the optical fiber is fixed in the optical fiber fixing structure. Sensitivity to high-sound-pressure sound waves is achieved, through the extremely-short optical path difference and the axisymmetric structure, the temperature change resistance of an optical path is improved, high-contrast interference is achieved, and the interference type optical fiber sensing probe has good stability. The optical fiber acoustic sensor probe is simple in structure, small in size, easy to manufacture and low in cost. The invention also relates to a diaphragm-free interference type optical fiber acoustic sensor.

Description

technical field [0001] The invention relates to the technical field of acoustic sensing, in particular to a diaphragm-free interference optical fiber acoustic sensor probe and an optical fiber acoustic sensor. Background technique [0002] As a new type of acoustic sensor, fiber optic acoustic sensor has high sensitivity, anti-electromagnetic interference, low transmission loss, and Corrosion, small size and light weight and other advantages. There are also extensive demands in application fields such as environmental noise monitoring, noise source location, and photoacoustic detection, especially for sound wave pickup in strong electromagnetic interference environments. Therefore, fiber optic acoustic sensors have been extensively studied. [0003] Most of the existing interferometric fiber optic acoustic sensors are based on the diaphragm structure, usually the upper limit of the dynamic range is small, and at the same time, the optical path of the interferometric struct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 程进秦雷厉军明张春倩高国伟
Owner BEIJING INFORMATION SCI & TECH UNIV
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