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A multiplexing optical fiber method-percavity microphone device

A microphone and optical fiber technology, applied in the field of acoustic sensing, can solve problems such as poor stability, unfavorable multiplexing, and complex system, and achieve the effects of high stability, good stability, and simple system structure.

Active Publication Date: 2021-03-19
BEIJING INFORMATION SCI & TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to overcome the problems of poor stability, high cost, complex system, and unfavorable reuse in the prior art, the present invention provides a multiplexing optical fiber method-percavity microphone device, which has good stability, low cost, simple structure, Easy to make and other features

Method used

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  • A multiplexing optical fiber method-percavity microphone device
  • A multiplexing optical fiber method-percavity microphone device
  • A multiplexing optical fiber method-percavity microphone device

Examples

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no. 1 example

[0067] Such as figure 1 As shown, it is a schematic diagram of the composition of the single-channel optical fiber method-percavity microphone of the present invention, including: the fiber optic method-percavity microphone probe 1 for inductive acoustic wave vibration, the monochromatic light source 2 capable of emitting monochromatic light, and realizing the one-way propagation of the light ring Three-port one-way light guide unit 3, a photodetector 4 for photoelectric signal conversion, a preconditioning circuit 5, an optical fiber 6, and an optical fiber flange 7; the monochromatic light source 2 is in phase with the port I301 of the three-port one-way light guide unit Connection, fiber optic method - Percavity microphone probe 1 is connected to port II302 of the three-port one-way light guide unit, photodetector 4 is connected to port III303 of the three-port one-way light guide unit; optical fiber 6 is used to connect monochromatic light source 2, Three-port one-way ligh...

no. 1 example 1

[0073] Each part of a multiplexed optical fiber method-percavity microphone device according to the first embodiment will be described in detail below.

[0074] The N-way monochromatic light source 222 is composed of a light-emitting unit 222a and a light-splitting unit 222b, wherein the light-emitting unit 222a is an ASE wide-spectrum light source or a laser, and the light-splitting unit 222b is a wavelength division multiplexer or an optical fiber beam splitter; when the light-emitting unit When 222a is an ASE wide-spectrum light source, the light splitting unit 222b is a wavelength division multiplexer; when the light emitting unit 222a is a laser, the light splitting unit 222b is a fiber beam splitter.

[0075] The one-way light guide unit 3 is a circulator, or a one-way light guide unit composed of an isolator 3a and a fiber coupler 3b.

no. 1 example 1

[0076] A schematic cross-sectional view of the probe structure of the first embodiment of a multiplexing optical fiber method-percavity microphone device, such as image 3 As shown, the probe 1 of a multiplexing optical fiber method-percavity microphone device in this embodiment includes: a housing 101, a diaphragm 102, an optical fiber ferrule 103, a ferrule sleeve 104, an overcoat 105, a probe optical fiber 106, a front cover 107 and The fixing screw 108, the probe of the optical fiber method-Percavity microphone is specifically described as follows:

[0077] Housing 101, such as Figure 4 Shown is a schematic cross-sectional view of the shell structure of a multiplexed optical fiber method-percavity microphone device according to the first embodiment of the present invention, which is a hollow structure, and the middle part of the inner wall is provided with a shell internal thread 101a, and the lower part of the shell 101 is perpendicular to The direction of the axis is p...

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Abstract

The invention provides a multiplex optical fiber Fabry-Perot microphone device which comprises N monochromatic light sources, an optical fiber Fabry-Perot microphone probe array, a photodetector array, a three-port single-guide light unit array, optical fibers, an optical fiber flange array and a pre-conditioning circuit array. N monochromatic light sources are connected with the port I of the corresponding three-port single-guide light unit through the optical fiber respectively. Each optical fiber Fabry-Perot microphone probe is connected with the port II of the corresponding three-port single-guide light unit through the optical fiber. Each photodetector is connected with the port III of the corresponding three-port single-guide light unit through the optical fiber. The output end of the photodetector array is connected with the pre-conditioning circuit array. The multiplex optical fiber Fabry-Perot microphone device provided by the invention has the advantages of simple structure,low cost, easy manufacture and good stability, and has good application prospects in sound source localization, sound field detection, speech recognition and other aspects.

Description

technical field [0001] The invention belongs to the technical field of acoustic sensing, and in particular relates to a multiplexing optical fiber method-percavity microphone device with good stability, low cost and simple structure. Background technique [0002] With the development of optical fiber technology, especially the development of optical fiber communication technology, optical fiber sensing technology has also developed rapidly. From the concept of optical fiber sensor to the present, in the past few decades, optical fiber sensing technology has been used in machinery, electronic instruments, It has been widely used in automatic control of production process, on-line detection, and fault diagnosis in the fields of aerospace, petroleum, chemical, and food safety. [0003] Compared with various traditional electrical sensors, fiber optic sensors have some unique advantages, such as high sensitivity, anti-electromagnetic interference, corrosion resistance, explosion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 程进邹小平秦雷王丽坤
Owner BEIJING INFORMATION SCI & TECH UNIV