High-wavelength-resolution fiber grating demodulation system and method

A fiber grating demodulation and resolution technology, which is applied in the direction of transmitting sensing components, converting sensor output, and measuring devices with optical devices, can solve the problems that cannot meet the requirements of high-precision and high-sensitivity measurement fields, and achieve the goal of overcoming Effects of non-linear tuning defects, improved resolution, and high precision

Active Publication Date: 2016-12-21
WUHAN UNIV OF TECH
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Problems solved by technology

However, the resolution of these demodulation systems cannot meet the requirements of high-precision and high-sensitivity measurement fields.

Method used

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  • High-wavelength-resolution fiber grating demodulation system and method
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  • High-wavelength-resolution fiber grating demodulation system and method

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Embodiment Construction

[0020] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0021] A kind of high wavelength resolution fiber grating demodulation system designed by the present invention, such as figure 1 As shown, it includes a tunable laser 1, a first optical splitter 2, a second optical splitter 3, a first optical coupler 4, a second optical coupler 5, a first photodetector 6, and a multi-wavelength calibrator 7. The second photodetector 8, the demodulation optical path 9, the third photodetector 10 and the data collector and processor 11, wherein the signal output end of the tunable laser 1 is connected to the signal input of the first optical splitter 2 end, the first signal output end of the first optical splitter 2 is connected to the signal input end of the second optical splitter 3, and the first signal output end of the second optical splitter 3 is connected to the input of the first optical coupler 4 end, t...

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Abstract

The invention provides a high-wavelength-resolution fiber grating demodulation system. In the system, the output end of a tunable laser is connected with a first light demultiplexer, the first output end of the first light demultiplexer is connected with a second light demultiplexer, the first output end of the second light demultiplexer is connected with a first optical coupler, the first sweep-frequency light output end of the first optical coupler is connected with a second optical coupler, the second sweep-frequency light output end of the first optical coupler is connected with the second optical coupler via a time delay fiber, the output end of the second light coupler is connected with a first photoelectric detector, the second output end of the second light demultiplexer is connected with a multi-wavelength calibration tool, the output end of the multi-wavelength calibration tool is connected with a second photoelectric detector, the second output end of the first light demultiplexer is connected with a demodulation optical path, the output end of the demodulation optical path is connected with a third photoelectric detector, and the output ends of the first, second and third photoelectric detectors are connected to a data collector and processor. According to the invention, the nonlinear tuning defect of the tunable laser can be overcome effectively, and the wavelength resolution is high.

Description

technical field [0001] The invention relates to the technical field of fiber grating demodulation, in particular to a fiber grating demodulation system and method with high wavelength resolution. technical background [0002] Due to the advantages of anti-electromagnetic interference, good insulation performance, corrosion resistance, large dynamic range, and wide measurement range, fiber grating sensors are widely used in aerospace, bridge monitoring, petrochemical, structural damage detection and many other fields. Changes in physical quantities such as temperature and stress will cause the center wavelength of the fiber Bragg grating to drift, and the external physical quantity can be detected by demodulating the center wavelength of the fiber Bragg grating. The fiber grating demodulation system with high wavelength resolution can more accurately measure the small center wavelength shift and restore the external physical quantity, which means that the system has high sens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353
CPCG01D5/35329
Inventor 李政颖向娜王凡孙文丰王洪海
Owner WUHAN UNIV OF TECH
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