High-precision fiber bragg grating displacement meter with function of temperature compensation

Abstract

The invention discloses a high-precision fiber bragg grating displacement meter with the function of temperature compensation. The high-precision fiber bragg grating displacement meter comprises a sensitive part, a spring and a feeler lever which are sequentially connected on the same central axis. The sensitive part comprises an optical fiber base, a strain measurement optical fiber grating and atemperature measurement optical fiber grating, and the strain measurement optical fiber grating and the temperature measurement optical fiber grating are both arranged on the optical fiber base. Thesensitive part and the spring are arranged on the same central axis, the number of influence factors in the measurement process is small, sensor repeatability and hysteresis errors are small, and linear fitting precision is high. The fiber bragg gratings comprise the strain grating and the temperature grating; when the environment temperature changes, temperature compensation is conducted on the strain grating through the temperature grating, the temperature compensation function is achieved, and the measurement precision is improved. The fiber bragg grating displacement meter is simple in structure, stable in performance and capable of measuring displacement and temperature simultaneously.

Description

technical field [0001] The invention belongs to the technical field of displacement detection, and in particular relates to a high-precision optical fiber grating displacement meter with temperature compensation. Background technique [0002] In recent years, the country has increased investment in infrastructure construction, but at the same time various natural disasters occur frequently, and the requirements for engineering safety monitoring are getting higher and higher. In the construction process monitoring of major engineering structures such as bridges, tunnels, dams, underground works, and slopes, as well as in the long-term health monitoring of the operation process, displacement detection is one of the most basic measurement items in measurement technology, and it is a measure of various physical quantities. Foundation. Displacement sensors can be divided into resistive type, vibrating wire type, inductive type and capacitive type according to different working p...

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Problems solved by technology

[0006] The invention provides a high-precision optical fiber grating displacement meter with temperature compensation, which solves the technical problems of poor measurement accuracy and complex structure of the above-mentioned optical fiber displacement meter

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