Temperature self-compensation fiber grating large-strain sensor

Abstract

A temperature self-compensation fiber grating large-strain sensor comprises bases, two capillary steel pipes, two fiber gratings, two vertical support plates and a horizontal support plate. The bases are respectively in a rectangular plate body structure, and are connected with the vertical support plates on the top surfaces of the bases through rotation connection shafts respectively; the two capillary steel pipes are fixedly arranged between the two vertical support plates in an up-and-down parallel manner; the two capillary steel pipes are in horizontally parallel state and are vertically and fixedly connected with the vertical support plates; the horizontal support plate is arranged between the two capillary steel pipes; the horizontal support plate is in horizontal state and the two ends of the horizontal support plate are movably connected with the two vertical support plates through the rotation connection shafts; the fiber gratings are packaged rigidly in the capillary steel pipes respectively after applying prestress; the bases and the horizontal support plate are parallel; and the bases are provided with screw holes. According to the temperature self-compensation fiber grating large-strain sensor, the problem of temperature and strain cross sensitivity can be solved, measuring sensitivity can be changed, and large-strain measurement of a test piece to be tested can be realized.

Description

technical field [0001] The invention relates to a wavelength modulation optical fiber sensor, in particular to a fiber grating strain sensor capable of eliminating temperature influence and strain cross sensitivity. Background technique [0002] Fiber Bragg grating sensor has the advantages of light weight, strong anti-electromagnetic interference ability, corrosion resistance, high temperature resistance, small signal attenuation, easy to form a multiplexing network, and integrates sensing and information transmission. It can solve measurement problems that are difficult to solve by conventional detection technologies , to meet the high-precision, long-distance, quasi-distributed and long-term, real-time, online technical requirements of modern engineering structure monitoring. [0003] At present, strain monitoring is an important means to monitor the health and safety of large-scale projects such as bridges and dams, as well as large-scale steel structures. In recent yea...

AI Technical Summary

Problems solved by technology

Due to the cross-sensitivity of fiber gratings to temperature and strain, it is difficult to eliminate the influence of temperature when measuring strain, thus limiting its practical application, and the current fiber grating sensors cannot solve the above problems well

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