Extrinsic optical fiber Fabry-Perot interference pressure sensor

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...

AI Technical Summary

Problems solved by technology

[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 transmission signals, complex structural design, and relatively high production process requirements. High; the resonant sensor is sensitive to the measurement medium, and cannot satisfy the ability to simultaneously monitor liquid and gas; and the existing Fap fiber sensor also has problems such as sensitivity to the medium, poor anti-interference ability and insufficient measurement accuracy; so the existing The current sensors generally have shortcomings such as insufficient precision, sensitivity to the measurement medium, and complex process structures.

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