A Miniature Fiber Optic Fabry Pressure Sensor

A pressure sensor, fiber optic technology, applied in the application of optical methods for fluid pressure measurement, fluid pressure measurement, instruments, etc., can solve the difficulty in manufacturing Brie-Perot fiber optic sensors, the bending degree of the diaphragm is easy to exceed its deflection, Problems such as difficulty in application, to achieve the effect of precise measurement accuracy, wide adaptability, and small volume

Active Publication Date: 2020-01-31
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the high temperature and high pressure environment of this kind of air cavity sensor, such as deep sea pressure detection, explosion pressure field measurement, etc., the bending degree of the diaphragm is easy to exceed its deflection.
Therefore, there are certain difficulties in the application of air cavity Fabry-Perot fiber optic sensors in ultra-high pressure and high temperature environments.
Difficult fabrication of air-cavity Fabry-Perot fiber optic sensors for measuring high temperature and high pressure

Method used

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  • A Miniature Fiber Optic Fabry Pressure Sensor
  • A Miniature Fiber Optic Fabry Pressure Sensor
  • A Miniature Fiber Optic Fabry Pressure Sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] see Figure 1 to Figure 5 , the miniature optical fiber Fabry pressure sensor, its sensor seat is a cube sensor seat 10, and the described axial force member is a cylindrical force-sensitive crystal 20; one end of the cube sensor seat 10 is provided There is a vertical stepped counterbore 11, all straight small elongated holes 12 in the middle of the other end of the cube sensor seat 10, and the small elongated hole communicates with the middle part of the stepped counterbore 11; The lower end of the sensitive crystal 20 is connected with the lower hole of the stepped counterbore 11, and the upper end is close to the mouth of the middle hole of the stepped counterbore 11; fixed, one end of the optical fiber 3 is perpendicular to the side 21 of the force-sensitive crystal 20, and an optical fiber Fab cavity is formed between the end face of the optical fiber and the side 21 of the force-sensitive crystal.

[0037] The miniature fiber optic Fabry pressure sensor also inc...

Embodiment 2

[0044] , see Image 6 and Figure 7 , the miniature optical fiber Fabry pressure sensor, the sensor seat is an annular sensor seat 30, which is provided with an elongated hole 31; the axial force member is a force cylinder 40, one side of which is provided with a The smooth plane 41 and the upper and lower ends are provided with flanges 42 as a positioning stop; the annular sensor seat 30 is set on the outside of the stressed cylinder 40, and the optical fiber 3 is arranged in the elongated hole 31 and Fixed by the set screw 13 , an optical fiber Fab cavity is formed between the end surface of the optical fiber 3 and the plane 41 on the annular sensor seat 30 .

[0045] The miniature fiber optic Fabry pressure sensor also includes:

[0046] Two positioning rings 8 are respectively embedded between the upper and lower ends of the stressed cylinder 40 and the annular sensor seat 30;

[0047] Two rubber sealing rings 9 are respectively set on the positions close to the flanges...

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PUM

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Abstract

The invention relates to a mini optical fiber Fabry-Perot pressure sensor. The mini optical fiber Fabry-Perot pressure sensor comprises a sensor base. An axial stress member and an optical fiber are arranged on the sensor base. One end of the optical fiber is perpendicular to the lateral side of the axial stress member. An optical fiber Fabry-Perot cavity is formed between one end face of the optical fiber and the lateral side of the axial stress member, and modulation of pressure signals is realized through change of the cavity length. The mini optical fiber Fabry-Perot pressure sensor has the advantages of small size, high resolution, high electromagnetic interference resistance and high detection accuracy.

Description

technical field [0001] The invention relates to pressure detection, in particular to a miniature optical fiber Fabry pressure sensor. [0002] technical background [0003] With the continuous improvement of the level of science and technology, the application field of sensors is constantly expanding, and the performance requirements of the sensors themselves are also constantly improving. Traditional sensors have been unable to meet the increasing performance requirements of sensors due to their own limitations. Pressure sensors are key components for various structural stress and fatigue damage detection in railway, transportation, construction engineering, mechanical engineering and other industries. How to realize force sensing with high precision, high reliability and high sensitivity has always been the goal pursued by people. Compared with traditional electrical force sensors such as variable resistance, variable capacitance, variable reluctance, piezoelectric, piezo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/24G01L11/02
CPCG01L1/242G01L11/025
Inventor 陈小强朱永王宁
Owner CHONGQING UNIV
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