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Brillouin Optical Time Domain Analysis (BOTDA)-based sensing device and method

A technology of optical time domain analysis and supercontinuum, applied in the field of sensing devices based on supercontinuum Brillouin optical time domain analyzer, can solve problems such as high cost, time-consuming, complex system structure and implementation process, and achieve Improve reliability and stability, improve signal-to-noise ratio, and adjust spatial resolution

Active Publication Date: 2019-10-25
TAIYUAN UNIV OF TECH
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Problems solved by technology

However, the system needs to cooperate with the adjustment of multiple parameters, the system structure and implementation process are complex, time-consuming and costly

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  • Brillouin Optical Time Domain Analysis (BOTDA)-based sensing device and method

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Embodiment Construction

[0028] A sensing device based on a supercontinuum Brillouin optical time domain analyzer, comprising a supercontinuum light source 1, a first tunable optical filter 2, a 1×2 first fiber coupler 3, and a first polarization controller 4. Microwave signal source 5, first high-speed electro-optic modulator 6, first optical amplifier 7, optical scrambler 8, optical isolator 9, sensing fiber 10, second polarization controller 11, second high-speed electro-optic modulator 12. Pulse generator 13, 1×2 second fiber coupler 14, second optical amplifier 15, optical circulator 16, third optical amplifier 17, 1×2 third fiber coupler 18, second tunable optical filter device 19, a third tunable optical filter 20, a first photodetector 21, a second photodetector 22, a third photodetector 23, a data acquisition card 24, and a computer 25.

[0029] Wherein, the outgoing end of supercontinuum light source 1 is connected with the incident end of first tunable optical filter 2; The incident end of...

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Abstract

The invention relates to a Brillouin Optical Time Domain Analysis (BOTDA)-based sensing device and method. The device comprises a supercontinuum source, three tunable light filters, three 1x2 opticalfiber couplers, two polarization controllers, two high-speed electrooptical modulators, a microwave signal source, three light amplifiers, a light scrambler, an optoisolator, a sensing optical fiber,an optical circulator, a pulse generator, three photoelectric detectors, a data acquisition card and a computer. The BOTDA-based sensing device can enlarge the dynamic range of BOTDA, prolongs a measuring distance of an optical fiber and improves the spatial resolution of the system; furthermore, the device detects optical signals in opposite directions, which solves the problems that the power isgradually lost and the detection range is limited for a traditional BOTDA single-channel signal with the prolonging of the distance of the optical fiber; by the adoption of the supercontinuum source,the device has a spectral range wider than that of a tunable laser device, and can cooperate with the light filters to generate tunable laser with adjustable wavelengths and changeable spatial resolutions; and the supercontinuum source is used as a pump light source in the device, so as to solve the problem of a limited measuring distance of a narrow-band laser device and enhance the stability ofthe system.

Description

technical field [0001] The invention is applied to the field of distributed optical fiber sensing and detection, and is specifically a sensing device and method based on a supercontinuum Brillouin optical time domain analyzer, which can realize high spatial resolution and long-distance detection of temperature or strain continuous measurement. Background technique [0002] The distributed optical fiber temperature and strain sensing technology based on Brillouin Optical Time Domain Analysis (BOTDA) is a new type of sensing technology developed in the past 30 years. The distribution information of the measured field, accurate positioning, dynamic measurement can be realized, and the distance can reach tens of kilometers or even hundreds of kilometers. Application prospects. [0003] Since the research based on Rayleigh scattering and Raman scattering has become mature, it is gradually becoming practical. The research on distributed sensing technology based on Brillouin sca...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D21/02
CPCG01D21/02
Inventor 张建忠张晓程李梦文张明江乔丽君王涛李健吴星亮
Owner TAIYUAN UNIV OF TECH
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