Bending sensing measuring system based on fiber ring laser

Abstract

The invention provides a bending sensing measuring system based on a fiber ring laser. The system is characterized in that a fine core fiber is welded into a resonant cavity of a fiber ring laser, wherein the fiber ring laser comprises a pumping laser, a wavelength division multiplexer, a erbium-doped fiber, an photocoupler, an 1*2 fiber coupler and a polarization controller; the fine core fiber is used for bending sensing and can be also sued as an optical filter; when in application, the fine core fiber is attached on the surface of an object to be measured; the output laser central wavelength of the fiber ring laser is measured through the fiber spectrograph, and then the bending degree of the object to be measured can be measured. According to the system, the mode selecting characteristics of the laser resonant cavity is utilized; the system has the characteristics of being high in detection signal, high in signal-to-noise ratio, narrow ling width, high in sensitivity, and free of temperature sensitivity, and can be applied to various actual engineering.

Description

technical field [0001] The invention provides a bending sensing measurement system based on an optical fiber ring laser, which belongs to the technical field of optical fiber sensing. Background technique [0002] Compared with the traditional bending sensor, the optical fiber bending sensor has the advantages of strong anti-electromagnetic interference, corrosion resistance, light weight, small size and easy remote monitoring. It can be used to monitor the bending deformation of bridges, subgrade settlement of roads and bending deformation of railway tracks. It can also be used to monitor the bending deformation of some high-precision instruments and important building structures, etc., and has a wide range of applications. [0003] Existing optical fiber bending sensors mainly include two types: light intensity modulation type and wavelength modulation type. The former has high requirements on the light intensity stability of the light source, and usually needs to use the...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a bending sensing measurement system based on fiber optic ring lasers, which overcomes the shortcomings of existing fiber optic bending sensors, such as weak detection signals, large bandwidth, and being easily affected by ambient temperature, by measuring the center of the output laser wavelength, so as to accurately obtain the bending degree of the measured object

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