A Fiber Bragg Grating Dynamic High Voltage Sensor

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, and particularly relates to a large-range high-pressure high-frequency response sensor based on optical fiber grating. Background technique [0002] In the field of national economy and national defense construction, especially the explosive test of military production and the development of strategic and tactical weapons, it is often necessary to measure high pressure. High pressure, especially dynamic high pressure testing, is the development of weapons and ammunition, aerospace vehicle launching, and material resistance. Blasting and engineering protection test, blasting construction, high-pressure synthesis of new materials, material constitutive relationship and other related fields are one of the important contents. Therefore, it has attracted the attention of scientific researchers from all over the world and has long been one of the research hotspots. [0003] At present, the commo...

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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