Sensing detection method and device for enhanced coherent optical time domain reflection
A technology of time-domain reflection and coherent light, applied in measuring devices, special recording/indicating devices, using wave/particle radiation, etc., can solve low signal-to-noise ratio, poor signal repeatability and consistency, and difficulties in developing subsequent pattern recognition algorithms and other problems to achieve the effect of suppressing the change of polarization state
Active Publication Date: 2017-07-11
WUHAN WUTOS
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[0004] In order to solve the problems of low signal-to-noise ratio, poor signal repeatability and consistency, and difficulty in developing subsequent pattern recognition algorithms in the existing coherent optical time-domain reflectometry technology, the present invention provides an enhanced coherent optical time-domain reflectometry sensor The method and device realize a monitoring system with a higher signal-to-noise ratio, and the monitoring signal has better reproducibility and reliability, and further reduces the difficulty of developing the pattern recognition algorithm of the subsequent related data processor
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[0031] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0032] The present invention divides the light into two different polarization states of light by using a polarization beam splitter and combiner and two photodetectors in combination, and then combines the two polarization states of light into one detection signal that is not affected by the change of the light polarization state , which can realize the suppression of the polarization fading phenomenon caused by the polarization state change of the detection optical signal returned in the sensing optical fiber in the coherent optical path.
[0033] The enhanced coherent optical time domain reflect...
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The invention discloses a sensing and detecting method and device for enhanced coherent optical time domain reflection. The method comprises the following steps: converting laser light into a detection light pulse signal; amplifying the detection light pulse signal, and passing the amplified light pulse signal through The circulator is transmitted to the sensing fiber with a local Rayleigh reflection enhancement structure; the returned optical signal in the sensing fiber is separated into two orthogonal polarization states of light, and they are respectively compared with the corresponding polarization state signals in the reference optical signal Perform coherent superposition; respectively collect the two polarization states of light after coherent superposition by two photodetectors, generate two detection signals and send them to the signal acquisition processor; the signal acquisition processor processes the incoming detection signals and performs The intensity and phase information are extracted to obtain the amount of information to be measured. The invention enhances the intensity of the local Rayleigh reflection signal in the optical fiber, and effectively suppresses the polarization fading phenomenon caused by the polarization state change of the detection optical signal returned in the sensing optical fiber in the coherent optical path.
Description
technical field [0001] The invention relates to the technical field of distributed optical fiber sensing and monitoring, in particular to a sensing and detecting method and device for enhanced coherent optical time domain reflection. Background technique [0002] Because fiber optic sensors have the advantages of long monitoring distance, convenient networking, anti-electromagnetic interference, and passive on-site, they have broader application prospects than electrical sensors. Among them, the distributed optical fiber sensing technology can realize a large-scale passive sensing network by using the easy remote transmission networking characteristics of the sensing optical fiber, which is very suitable for the safety monitoring and management of the environmental status information of the long-distance distributed monitoring objects. It has been applied in industrial fields such as safety warning of oil and gas pipelines and environmental disturbance information monitoring...
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IPC IPC(8): G01D3/036G01H9/00
Inventor 闫奇众印新达王丹
Owner WUHAN WUTOS