An Ultra-Long Distance Distributed Optical Fiber Vibration Sensing Monitoring System
A distributed optical fiber and vibration sensing technology, applied in measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems of low positioning accuracy, large monitoring error, short monitoring distance, etc., and achieve high accuracy and low cost. , good monitoring distance
Active Publication Date: 2017-04-12
SHANGHAI YUANZHOU PIPE
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Problems solved by technology
[0005] The existing technology has short monitoring distance, low positioning accuracy, large monitoring error and high equipment cost
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[0015] See attached figure 1 , the present invention consists of a narrow linewidth laser 1, a 1X2 coupler 2, two optical fiber acousto-optic modulators 3, an erbium-doped fiber amplifier 4, an optical fiber circulator 5, two 2X2 couplers 6, a control circuit 7, a semiconductor fiber amplifier 8, a dual The balance detector 9, the acquisition card 10 and the computer 11 are composed. The output end of the narrow linewidth laser 1 is connected to the input end of the 1X2 coupler 2; the output end of the 1X2 coupler 2 is respectively connected to the input ends of two optical fiber acousto-optic modulators; the output end of the first optical fiber acousto-optic modulator 3 Connect with erbium-doped optical fiber amplifier 4 input ends; Described another optical fiber acousto-optic modulator 3 output ends are connected with another 2X2 coupler 6 input ends, its output end is connected with a 2X2 coupler 6 output ends; Described control circuit 7 is connected with two optical fi...
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The invention discloses a super-long-distance distributed type optical fiber vibration sensing monitoring system which comprises a 1 * 2 coupler connected with a laser device. The output of the 1 * 2 coupler is connected with a 2 * 2 coupler and a modulator of an access control circuit. The output end of the modulator is connected in series with an amplifier and then is connected with a circulator which is connected with the 2 * 2 coupler. The output end of the 2 * 2 coupler is connected in series with a detector and a collecting card and then is connected with a computer. The system is characterized in that a connecting circuit of the 1 * 2 coupler and the 2 * 2 coupler is connected in series with another modulator and another 2 * 2 coupler, and the 2 * 2 coupler is connected in series with an annular string of an optical fiber amplifier to form an optical fiber ring. Compared with the prior art, the system has the advantages that corrosion resistance and anti-interference performance are achieved, super-long monitoring distance of at least 100 km is achieved, the structure is simple, equipment investment is low, accuracy is high, mounting, using and maintaining are convenient, and a wide application range is achieved.
Description
[0001] The invention relates to the technical field of distributed optical fiber sensing, in particular to an ultra-long-distance distributed optical fiber vibration sensing monitoring system. Background technique [0002] At present, distributed optical fiber vibration sensing monitoring technology is mainly divided into two categories: based on interference technology and based on OTDR (Optical Time-Domain Reflectometer, Optical Time Domain Reflectometer) technology. Distributed optical fiber vibration sensing monitoring technology has a very wide range of application scenarios due to its passive, long-distance monitoring, corrosion resistance, anti-interference and other advantages, such as perimeter placement in specific areas, long-distance pipeline safety monitoring, etc., this technology In recent years, it has become the focus of research in the field of optical fiber sensing. [0003] The distributed optical fiber vibration sensing monitoring system based on interfero...
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IPC IPC(8): G01H9/00
Inventor 武达周文忠周森洪祝正明
Owner SHANGHAI YUANZHOU PIPE