Device and system for monitoring wide-range displacement of optical fiber grating

Abstract

The invention provides a device and system for monitoring wide-range displacement of an optical fiber grating. The device comprises a shell and an optical fiber grating displacement measuring assemblyarranged in the shell, wherein the optical fiber grating displacement measuring assembly comprises a displacement sensing assembly with an input end fixedly connected with a to-be-measured target, adisplacement conversion assembly with an input end connected with an output end of the displacement sensing assembly, and a displacement measuring assembly with an input end connected with an output end of the displacement conversion assembly. The conversion assembly is utilized to convert real-time displacement of the to-be-measured target into measurable displacement within a measuring range ofthe optical fiber grating through a strain acquisition transmission assembly, the measurable displacement is converted into wavelength drift amount of the optical fiber grating, the wavelength of theoptical fiber Bragg grating is measured through a spectrometer, and the displacement amount of the to-be-measured target is calculated according to the wavelength drift amount, so that the real-time strain of the to-be-measured target is measured through the measurable range of the optical fiber grating, and the beneficial technical effect of expanding the measuring range of the optical fiber grating is achieved.

Description

technical field [0001] The invention relates to the field of engineering measuring tools, in particular to a fiber grating wide-range displacement monitoring device and system. Background technique [0002] Displacement measurement is quite common and necessary in the engineering field, but traditional measurement methods mainly have disadvantages such as low monitoring efficiency, high measurement cost, low degree of automation and low measurement accuracy. As a new type of material that can "transmit" and "sense", fiber grating mainly uses the photosensitive properties of the fiber core material to write the coherent field pattern into the fiber core in a certain way, so that the refractive index of the fiber core is along the axial direction. Periodic changes occur, thereby forming a fiber grating. Fiber Bragg Grating uses light as the transmission medium, and has the characteristics of low insertion loss, light weight, small size, strong anti-electromagnetic interferenc...

AI Technical Summary

Problems solved by technology

[0003] Therefore, there is an urgent need for a large-range displacement monitoring device based on fiber gratings to solve the problem of small measurement ranges of fiber gratings

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