Fiber brag grating dynamic high-pressure transducer

Abstract

The invention discloses a fiber brag grating dynamic high-pressure transducer which comprises a membrane body, a supporting column, a grating containing fiber brag, an installation shell body, an optical fiber protecting bush and a fixing connector. The membrane body is fixed at the front end of the installation shell body and then forms a pressure sensing face of the sensor. The grating is parallelly pasted to the surface of an inner hole of the supporting column in the axial direction. The hole is full of filling glue. The upper end face of the supporting column is in tight contact with the membrane body. A conical type contact face is adopted between the lower end face of the supporting column and the installation shell body. The optical fiber arranged in the fiber protecting bush in a sleeved mode is fixed at the lower end of the installation shell body through the fixing connector. The fiber brag grating dynamic high-pressure transducer is characterized in that pressure deformation of the circular supporting column is utilized to convert outside pressure into strain changes of the fiber brag grating (FBG), and pressure sensing is realized through measurement of strain. The sensor is firm in structure, high-temperature resistant, strong impact vibration resistant, free of electromagnetic interference, especially suitable for being used in severe environments such as explosion environment, and is convenient and quick to manufacture and low in cost.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to a large-range, high-pressure, high-frequency response sensor based on an optical fiber grating. Background technique [0002] In the field of national economy and national defense construction, especially in the explosion test of military production and strategic and tactical weapon development, it is often necessary to measure high pressure. It is one of the important contents in related fields such as blasting and engineering protection test, blasting construction, high-pressure synthesis of new materials, material constitutive relationship, etc. [0003] At present, commonly used methods for high pressure measurement include copper pillar manometry, piezoelectric sensor manometry, and piezoresistive sensor manometry. The copper column manometer is a mechanical sensor, which uses the plastic deformation of the material to measure the pressure. The advantages are ...

AI Technical Summary

Problems solved by technology

However, what the fiber grating can directly respond to is the change of strain and temperature. When the fiber grating is used as a pressure sensor, due to the low pressure sensitivity of the bare fiber grating, it is necessary to use different packaging methods to improve the pressure sensitivity, mainly using bellows, Cantilever beams, spring tubes, diaphragms, metal or alloy strain tubes and other methods are used to measure pressure, but these methods are not suitable for high-frequency pressure measurement

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