Bending sensing measuring system based on fiber ring laser

A ring laser and bending sensing technology, applied in the field of bending sensing measurement system, can solve the problems of wide bandwidth, weak detection signal, and susceptibility to environmental temperature

Active Publication Date: 2015-05-13
CHINA JILIANG UNIV
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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...

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  • Bending sensing measuring system based on fiber ring laser
  • Bending sensing measuring system based on fiber ring laser
  • Bending sensing measuring system based on fiber ring laser

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Embodiment Construction

[0020] Below in conjunction with accompanying drawing and embodiment example, the present invention will be further described:

[0021] See attached figure 1 , a bending sensing measurement system based on fiber ring laser, which consists of pump laser (1), wavelength division multiplexer (2), erbium-doped fiber (3), optical isolator (4), 1*2 type fiber It consists of a coupler (5), a thin-core optical fiber (6), an optical fiber spectrometer (7), a polarization controller (8) and a connecting optical fiber (9). Wherein, the two ports on one side of the wavelength division multiplexer (2) are respectively connected to the pump laser (1) and the erbium-doped optical fiber (3) through the connecting optical fiber (9), and the ports on the other side of the wavelength division multiplexer (2) One port is connected with one end of the polarization controller (8) through the connecting fiber (9); the other end of the erbium-doped fiber (3) is connected with one end of the optical ...

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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...

Claims

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Application Information

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IPC IPC(8): G01B11/16
Inventor 王东宁徐贲熊辉龚华平倪凯刘红林陈慧芳
Owner CHINA JILIANG UNIV
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