Extrinsic optical fiber Fabry-Perot interference pressure sensor

A pressure sensor and extrinsic technology, which is used in converting sensor output, using optical devices to transmit sensing components, instruments, etc., can solve the problems of insufficient measurement accuracy, insufficient precision, and large attenuation of long-distance transmission signals.

A pressure sensor and extrinsic technology, which is used in converting sensor output, using optical devices to transmit sensing components, instruments, etc., can solve the problems of insufficient measurement accuracy, insufficient precision, and large attenuation of long-distance transmission signals.

CN112903154APending Publication Date: 2021-06-04重庆拜安科技有限公司
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  • Extrinsic optical fiber Fabry-Perot interference pressure sensor
  • Extrinsic optical fiber Fabry-Perot interference pressure sensor
  • Extrinsic optical fiber Fabry-Perot interference pressure sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] An extrinsic optical fiber F-P interference pressure sensor, comprising a F-P interference device, a transmission optical cable 6 and a photoelectric demodulator.

[0038] The Faber interference device includes a stress cylinder 1, a housing 3, a support ring 2, and a FC / UPC ceramic ferrule 4 with a single-mode optical fiber 5;

[0039] as attached figure 1 As shown, one end face of the stress cylinder 1 is threadedly connected to the shell 3, the end face penetrates into the shell 3 and is fixedly connected with the support ring 2, a cavity is left between the end face and the support ring 2, and FC / UPC ceramic Ferrule 4 is fixed at the central hole of support ring 2 by adhesive; wherein, as attached figure 2 As shown, the optical fiber 5 inside the FC / UPC ceramic ferrule 4 is perpendicular to the end face of the stress cylinder 1. The Fabber chamber 7 of the interference device; when the pressure of the stress cylinder 1 increases or decreases, the end face of the ...

Embodiment 2

[0049] The difference between Embodiment 2 and Embodiment 1 is that the surface of the support ring 2 is provided with a through hole, so that the ambient pressure enters the Fapling interference device, and the initial pressure formed by the expansion of the air inside the Fappling interference device due to temperature changes is eliminated. , thus forming a vented gauge pressure sensor.

Embodiment 3

[0051] The difference between Embodiment 3 and Embodiment 1 is that the surface of the support ring 2 is provided with a pressure sensor joint, so that the Farpert interference device can measure the difference between the pressure of the medium and the pressure of the atmosphere to form a differential pressure sensor.

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Abstract

The invention relates to the technical field of optical fiber sensing, in particular to an extrinsic optical fiber Fabry-Perot interference pressure sensor which comprises a stress cylinder, a shell, a supporting ring and an insertion core with an optical fiber. One end face of the stress cylinder is in threaded connection with the shell, the end face penetrates into the shell and is fixedly connected with the supporting ring, a cavity is reserved between the end face and the supporting ring, and the FC / UPC ceramic ferrule is fixed to a center hole of the supporting ring; and the optical fiber in the insertion core is perpendicular to the end face of the stress cylinder, and the end face of the stress cylinder, the optical fiber in the insertion core and a gap between the stress cylinder and the insertion core form a Fabry-Perot cavity of the extrinsic Fabry-Perot interference pressure sensor. The extrinsic optical fiber Fabry-Perot interference pressure sensor is insensitive to a measured medium, can meet the capability of simultaneously monitoring liquid and gas, and is applied to the technical field of optical fiber sensing.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to an extrinsic optical fiber F-P interference pressure sensor. Background technique [0002] Pressure measurement has a wide range of needs in engineering technology and daily life, and has the broadest market. The most familiar ones are "atmospheric pressure" and "vacuum", which are the most typical expressions of pressure. In order to meet the pressure measurement requirements in different places, various advanced pressure measurement sensors have been produced, including mechanical structure pointer type, electromechanical type, piezoresistive type, resonance type and other types. [0003] However, the existing traditional mechanical pointer interference pressure sensors cannot realize automatic data collection and reading, and the accuracy is not high enough; electromechanical and piezoresistive pressure sensors have large attenuation of long-distance transmissio...

Claims

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Application Information

Patent Timeline
04 Jun 2021
Publication
CN112903154A
IPC
G01L1/24; G01D5/353
CPC
G01D5/35312; G01L1/242
Inventors
谭建平; 冉小东