A sensing device and method based on supercontinuum Brillouin optical time domain analyzer
An optical time domain analysis and supercontinuum technology, which is applied in the field of sensing devices based on a supercontinuum Brillouin optical time domain analyzer, can solve the problems of complex system structure and implementation process, high cost and time-consuming, etc. Improve reliability and stability, improve signal-to-noise ratio, and the effect of adjustable spatial resolution
Active Publication Date: 2021-03-02
TAIYUAN UNIV OF TECH
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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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[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 device includes a supercontinuum light source, three tunable optical filters, three 1×2 fiber couplers, two polarization controllers, two high-speed electro-optic modulators, a microwave signal source, three optical amplifiers, an optical disturbance Polarizer, optical isolator, sensing fiber, optical circulator, pulse generator, three photodetectors, data acquisition card, computer. The present invention can enhance the dynamic range of BOTDA, increase the measuring distance of the optical fiber and improve the spatial resolution of the system; moreover, the device adopts the phase detection optical signal to solve the traditional BOTDA single-channel signal, and the power will be gradually lost with the increase of the optical fiber distance , the problem of limited detection distance; the invention uses a supercontinuum light source, which has a wider spectral range than tunable lasers. It can cooperate with optical filter to generate tunable laser with adjustable wavelength and variable spatial resolution. The invention adopts the supercontinuum light source as the pumping light source to solve the limited measurement distance of the narrow-band laser and enhance the stability of the 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 prospect. [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 scat...
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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