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Brillouin Optical Time Domain Analysis System and Method

A technology of optical time domain analysis and Bragg grating, applied in the field of monitoring, can solve the problem of low signal-to-noise ratio, achieve the effect of improving signal-to-noise ratio, ensuring measurement accuracy, and reducing non-local effects

Active Publication Date: 2019-09-20
SUZHOU GUANGGE EQUIP
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Problems solved by technology

[0005] Based on this, it is necessary to provide a Brillouin optical time domain analysis method for the low signal-to-noise ratio caused by pump depletion and nonlinear effects in the current long-distance Brillouin distributed optical fiber sensing system. System and method

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  • Brillouin Optical Time Domain Analysis System and Method

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Embodiment Construction

[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments.

[0046]An embodiment of the present invention provides a Brillouin optical time-domain analysis system, including a laser, an electro-optic modulation link, a probe light generation link, a dual-frequency pulse light generation link, a first Bragg grating module, and a second Bragg grating module And a signal processing module, wherein, the laser is used to generate continuous light with a narrow linewidth; the electro-optic modulation link is used to modulate the continuous light to obtain a dual-frequency optical carrier; the detection light generat...

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Abstract

The invention relates to a Brillouin optical time-domain analysis system and method. The system modulates continuous light through an electro-optic modulation link to obtain a dual-frequency optical carrier, and generates a link through a detection light generation link and a dual-frequency pulse light generation link. The dual-frequency optical carrier generates four different frequencies of probe light and dual-frequency pulsed light, where the optical signal power of each frequency is below its nonlinear threshold; then the dual-frequency pulsed light is controlled by the first Bragg grating module to generate time delay In order to eliminate the crosstalk of dual-frequency pulsed light, two paths of pump light are formed and injected into the fiber, and the Brillouin signal light formed by the interaction of the probe light and pump light injected into the fiber is compensated for time delay through the second Bragg grating module , and finally obtain the Brillouin frequency shift data of the optical fiber after signal processing. In this way, the non-linear effect introduced by the high power of single-frequency pulsed light and signal light is avoided, the power requirement of pulsed light is reduced, the signal-to-noise ratio of the system is improved, and the non-local effect caused by pump depletion is reduced.

Description

technical field [0001] The invention relates to the technical field of monitoring, in particular to a Brillouin optical time domain analysis system and method. Background technique [0002] The distributed optical fiber temperature and strain monitoring system based on the principle of Brillouin scattering is widely used in power cables, tunnel tubes, etc. In the safety monitoring of major structures such as corridors, water conservancy projects, and long-distance oil and gas pipelines. However, at present, in the sensing fiber, the maximum incident light power of both pulsed light and continuous light is limited, the peak power of pulsed light cannot be higher than 100-150mw due to modulation uncertainty, and continuous light is finally limited by the amplified Self-Brillouin scattering, the power cannot be greater than 5mw, so the signal-to-noise ratio and distance cannot be improved by infinitely increasing the power of pulsed light and continuous light. The interaction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32G01B11/16G01K11/3206G01K11/322
CPCG01B11/16G01K11/32G01K11/3206G01K11/322
Inventor 陈科新吴正明张树龙
Owner SUZHOU GUANGGE EQUIP
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