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A botdr signal demodulation method

A signal demodulation and signal technology, applied in the field of photoelectric detection, can solve the problems of low sensitivity and resolution, low BOTDR signal demodulation sensitivity, etc., and achieve the effects of improving demodulation sensitivity, novel design and improving resolution

Inactive Publication Date: 2016-07-27
NORTHEASTERN UNIV LIAONING
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Problems solved by technology

However, since the effect of Fresnel reflection and Rayleigh scattering is suppressed by the method of controlling the arm length difference, and the sensitivity of the interferometer is related to the difference of the interference arm length in the ordinary Mach-Zhender interferometer, this method has no effect on the BOTDR signal The demodulation sensitivity is not high, which leads to low sensitivity and resolution of the measurement system to the measured

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  • A botdr signal demodulation method

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[0015] The specific structure, principle and demodulation method of the present invention will be further described below in conjunction with the accompanying drawings.

[0016] figure 1 It is a schematic diagram of the overall principle structure of the BOTDR signal demodulation method provided by the present invention. The output signal of the BOTDR sensing unit 1 enters the signal demodulation unit 2, and the Stokes light wavelength (frequency) in the output signal light of the BOTDR sensing unit 1 is demodulated by the signal demodulation unit 2, and the output signal of the signal demodulation unit 2 passes through The signal processing unit 3 is shown.

[0017] In the BOTDR signal demodulation system proposed by the present invention, the phase sensitivity expression of the Mach-Zhender interferometer used to demodulate the Stokes optical frequency is:

[0018] S I = dΔθ dω = ...

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Abstract

A BOTDR signal demodulation method, which belongs to the field of photoelectric detection technology. It consists of a BOTDR sensing unit (1), a signal demodulation unit (2) and a signal processing unit (3). The BOTDR sensing unit (1) includes a light source (10), a modulator (12), and a signal generator (13 ), an erbium-doped fiber amplifier (16), a fiber circulator (17) and a distributed measurement fiber (18). The signal demodulation unit (2) includes a Mach‑Zhender interferometer for demodulating the BOTDR signal. The signal The processing unit (3) includes a detector (30) and an oscilloscope (32). Its characteristic is that a Gaussian non-uniform fiber grating (21) is introduced into an interference arm of the Mach-Zhender interferometer, which uses its filtering characteristics to weaken the noise light intensity, and also uses its ability to produce slow light. Improved Mach‑Zhender interferometer sensitivity.

Description

technical field [0001] The invention relates to a BOTDR signal demodulation method, which belongs to the technical field of photoelectric detection. Background technique [0002] The distributed optical fiber sensor based on Brillouin Optical Time Domain Reflectometry (BOTDR) technology is a widely used distributed sensor. The key technology is to perform real-time dynamic demodulation of the frequency of Stokes light in the output signal light generated by the BOTDR sensing unit. The traditional BOTDR signal demodulation method adopts the coherent self-heterodyne method. By coherently coherent the BOTDR signal returned by the distributed measurement fiber with the reference optical signal, and then demodulates the frequency of the BOTDR signal at different times. However, in the traditional BOTDR signal demodulation method, due to the need to build an optical path to move the frequency of the optical signal emitted by the light source, this method not only has a complex op...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353
Inventor 赵勇张亚男韩博
Owner NORTHEASTERN UNIV LIAONING
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