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Optical fiber fabry-perot cavity microphone probe

A technology of microphone and optical fiber, which is applied in the field of acoustic sensing, can solve the problems of poor stability of optical fiber method-Percavity microphone probe, etc., and achieve the effects of good temperature adaptability, small size and simple structure

Active Publication Date: 2018-08-24
BEIJING INFORMATION SCI & TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to overcome the problem of poor stability of the optical fiber method-Percavity microphone probe in the prior art, the present invention provides a fiber optic method-Percavity microphone probe, which reduces the influence of temperature and external force, so that the fiber optic method-Percavity microphone probe itself has Good stability for practical use

Method used

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  • Optical fiber fabry-perot cavity microphone probe
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  • Optical fiber fabry-perot cavity microphone probe

Examples

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no. 1 example

[0047] In a first exemplary embodiment of the present invention, a fiber-optic cavity microphone probe is provided. First embodiment, a kind of optical fiber method-Purple cavity microphone probe structural cross-sectional schematic diagram, as figure 1 As shown, a fiber optic method-percavity microphone probe in this embodiment includes: a housing 1 , a diaphragm 2 , an optical fiber ferrule 3 , a ferrule sleeve 4 , a jacket 5 , an optical fiber 6 , a front cover 7 and fixing screws 8 .

no. 1 example 1

[0049] First Embodiment A kind of optical fiber method-Purple cavity microphone probe comprises:

[0050] Shell 1, such as figure 2 Shown is a schematic cross-sectional view of the shell structure of a fiber-optic cavity microphone probe 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 101, and the lower part of the shell 1 is perpendicular to the direction of the axis There are fixing screw holes 102, and the number of holes is 2-4, which are evenly distributed along the circumference;

[0051] The vibrating membrane 2 is a thin film, which is arranged at the front end of the shell 1, and is used for sensitive sound waves, and its surface facing the inner side of the shell has a reflective effect, as a reflective surface 201 of the optical fiber method-percavity structure;

[0052] The optical fiber ferrule 3 is a hollow columnar structure made of a single ...

no. 2 example

[0068] The second embodiment of the present invention is a kind of optical fiber method-Purple cavity microphone probe structure cross-sectional schematic diagram as shown in FIG. Figure 7 As shown, the difference with the first embodiment of a kind of optical fiber method-percavity microphone probe is:

[0069] The shell material is nickel-copper alloy, and its thermal expansion coefficient is about 14.4×10 -6 / ℃; ferrule sleeve is nickel-copper alloy, its thermal expansion coefficient is about 14.4×10 -6 / °C; the optical fiber ferrule 3 is composed of different materials in series, and is composed of a hard polymer epoxy resin 301 and a zirconia ceramic 302 in series, and the thermal expansion coefficient of the epoxy resin is about 54.77×10 -6 / °C, the coefficient of thermal expansion of zirconia ceramics is about 9.65×10 -6 / °C, by controlling the ratio of hard polymer epoxy resin and zirconia ceramics, the thermal expansion coefficient of the optical fiber ferrule 3 fo...

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Abstract

The invention provides an optical fiber fabry-perot cavity microphone probe with good stability. The optical fiber fabry-perot cavity microphone probe with good stability comprises a shell, a vibrating diaphragm, an optical fiber inserting core, an inserting core sleeve, an outer sleeve, an optical fiber, a retaining screw, and a front cover. The shell is of a hollow structure and screw threads are formed in the middle of the shell. A fixed screw hole is formed in the lower part of the shell. The vibrating diaphragm is arranged at the front end of the shell and is provided with a light reflecting effect towards one side inside the shell. The optical fiber inserting core is of a hollow columnar structure and is composed of a single material, or different materials compounded in series. Theinserting core sleeve is of a hollow cylinder structure, and screw threads are arranged on the outer side surface of the middle of the shell. The inserting core sleeve is installed inside the shell. One side, facing the vibrating diaphragm, of the inserting core sleeve is used for installing the optical fiber inserting core. The outer sleeve is of a cap-shaped structure with openings at the two ends thereof. The outer sleeve is arranged at the lower end of the shell. The inserting core sleeve is sleeved in the outer sleeve. The optical fiber is fixed in the optical fiber inserting core throughthe inserting core sleeve. The retaining screw is fixedly arranged in a screw hole at the lower part of the shell and is used for assisting the fixation of the inserting core sleeve. The front coveris arranged outside the shell from one side of the vibrating diaphragm. The optical fiber fabry-perot cavity microphone probe is simple in structure, easy to manufacture, good in stability and good inapplication prospect.

Description

technical field [0001] The invention belongs to the technical field of acoustic sensing, in particular to an optical fiber method-percavity microphone probe with good stability. 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-proof, low loss, and long transmission distance. As a ...

Claims

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Application Information

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IPC IPC(8): G01J3/26
CPCG01J3/26
Inventor 程进邹小平秦雷王丽坤
Owner BEIJING INFORMATION SCI & TECH UNIV