Single-end chaotic Brillouin optical time-domain analysis distributed fiber sensing device and method

A technology of optical time domain analysis and distributed optical fiber, which is applied in the direction of using optical devices, measuring devices, and thermometers with physical/chemical changes, can solve problems such as limited application range, inability to work, and sensor system paralysis, and achieve Solve the measurement distance and spatial resolution, overcome the effect of measurement distance and spatial resolution, and increase the sensing distance

Active Publication Date: 2016-07-20
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0005] The invention solves the irreconcilable contradiction between the measurement distance and the spatial resolution of the existing distributed optical fiber sensing device using the optical pulse signal as the detection signal in the existing Brillouin optical time domain analysis, as well as the inconsis...

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  • Single-end chaotic Brillouin optical time-domain analysis distributed fiber sensing device and method

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Embodiment Construction

[0023]Distributed optical fiber sensing device for single-ended chaotic Brillouin optical time domain analysis, including chaotic laser 1, 1×2 first fiber coupler 2, first high-speed electro-optic modulator 3, microwave signal source 4, and optical scrambler 5. 2×1 fiber optic coupler 6, optical circulator 7, sensing fiber 8, fiber optic mirror 9, second high-speed electro-optic modulator 10, pulse generator 11, 1×2 second fiber optic coupler 12, first Optical amplifier 13, second optical amplifier 14, 1×2 third optical fiber coupler 15, first optical bandpass filter 16, second optical bandpass filter 17, first photodetector 18, second photodetector 19. The third photodetector 20, data acquisition card 21, computer 22;

[0024] Wherein, the output end of the chaotic laser 1 is connected to the input end of the 1×2 first fiber coupler 2;

[0025] The first output end of the 1×2 first fiber optic coupler 2 is connected to the input end of the first high-speed electro-optic modu...

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Abstract

The invention relates to the field of distributed fiber sensing, specifically a single-end chaotic Brillouin optical time-domain analysis distributed fiber sensing device and method. The device and method solve problems that there is an irreconcilable conflict between the measurement distance and spatial resolution when a conventional Brillouin optical time-domain analysis distributed fiber sensing device employs an optical pulse signal as a detection signal, and the application range is limited because a sensing system is broken down and cannot work during the appearing of a break point in a sensing fiber because of a double-end mode. The device and method employs a chaotic laser signal to replace the optical pulse signal, achieves the measurement and positioning of the temperature or strain of an optical fiber, and employs a single-end BOTDA (Brillouin optical time-domain analysis) sensing system. The device and method can avoid the conflict between the sensing distance and spatial resolution in a conventional Brillouin optical time-domain analysis distributed fiber sensing system, and solves a limit problem that a double-end BOTDA sensing system cannot work normally when the break point appears in the optical fiber.

Description

technical field [0001] The invention relates to distributed optical fiber sensing technology, in particular to a distributed optical fiber sensing device and method for single-end chaotic Brillouin optical time domain analysis. Utilizing the backward Rayleigh scattering and Brillouin stimulated scattering effect of chaotic laser in the optical fiber, high spatial resolution and long-distance continuous measurement of temperature or strain can be realized. Background technique [0002] Distributed optical fiber sensing technology, using ordinary single-mode optical fiber as the sensing transmission medium, can conduct large-scale fully distributed temperature and strain monitoring of the measured field along the optical fiber. It has been used in aerospace, civil engineering, smart grid and other fields be widely used. [0003] Distributed optical fiber sensing technology has been developed rapidly, and breakthroughs have been made in the following three aspects: ① Distribut...

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Application Information

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IPC IPC(8): G01K11/32G01B11/16G01K11/322
CPCG01B11/165G01K11/32G01K11/322
Inventor 张建忠张明江刘毅王云才张明涛冯昌坤李铸平
Owner TAIYUAN UNIV OF TECH
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