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A Bending Sensing Measurement System Based on Fiber Ring Laser

A ring laser and bending sensing technology, applied in the field of bending sensing measurement systems, can solve the problems of being easily affected by ambient temperature, weak detection signal, and large bandwidth.

Active Publication Date: 2017-08-15
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 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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  • A Bending Sensing Measurement System Based on Fiber Ring Laser
  • A Bending Sensing Measurement System Based on Fiber Ring Laser
  • A Bending Sensing Measurement 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 measurement system based on an optical fiber ring laser, which is characterized in that a section of thin-core optical fiber is welded to a pump laser, a wavelength division multiplexer, an erbium-doped optical fiber, an optical isolator, and a 1*2 A fiber ring laser resonator composed of a type fiber coupler and a polarization controller. The thin-core fiber acts as a bend sensor on the one hand and as an optical filter on the other. In application, the thin-core optical fiber is adhered to the surface of the object to be measured, and the fiber optic spectrometer is used to measure the central wavelength of the output laser of the fiber ring laser, and the bending degree of the object to be measured can be determined. The invention utilizes the mode selection characteristic of the laser resonant cavity, has the characteristics of strong detection signal, high signal-to-noise ratio, narrow line width, high sensitivity and insensitive temperature, and can be applied in various practical projects.

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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Patent Type & Authority Patents(China)
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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