Anti-false and missed alarm method based on phase-sensitive optical time-domain reflectometry sensor
A technology of phase-sensitive light and time-domain reflection, applied in transmission systems, electromagnetic wave transmission systems, electrical components, etc., can solve the problems of increasing system hardware costs, lack of redundant and complementary data support, etc., to reduce system costs and improve The effect of adaptability and accurate positioning results
Active Publication Date: 2021-03-09
北京博感光科科技有限公司
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[0016] Multiplexing the phase-sensitive optical time domain reflectance sensor with other disturbance sensors can provide new data sources to supplement or correct the detection results, and reduce the false alarm rate and missed alarm rate of the sensor to a certain extent, but it will inevitably increase the system hardware cost, and the data processing method is to dig into the single data of the phase-sensitive optical time-domain reflectometry sensor, lacking redundant and complementary data support
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[0050] The optical path structure of the phase-sensitive optical time-domain reflectometry sensor in this embodiment is as follows figure 1 As shown, it includes a fiber laser 1, an acousto-optic modulator 2, an acousto-optic modulator driving power supply 3, an erbium-doped fiber amplifier 4, a filter 5, a circulator 6, a sensing fiber 7, a photodetector 8, and a data acquisition card 9 and computer 10; In the present embodiment, the phase-sensitive optical time-domain reflectometry sensor injects light pulses into the sensing fiber 7, and receives the back Rayleigh scattered light generated by each position of the sensing fiber with a photodetector 8, according to the received Back Rayleigh scattered light is used to judge whether there is an intrusion near the sensing fiber through data processing and determine the location of the intrusion.
[0051] In this embodiment, the anti-false alarm and missing alarm method based on the phase-sensitive optical time-domain reflectome...
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The invention discloses a method for preventing false and missed alarms based on a phase-sensitive optical time-domain reflection sensor, which is characterized in that pulse light whose width varies according to a fixed law is injected into the sensing optical fiber, and data collected under different pulse widths are regarded as different For the output of the sensor, the multi-sensor information fusion algorithm is used to comprehensively process the collected data, and according to the result of the comprehensive processing, it is judged whether there is an intrusion event along the sensing optical fiber, and the specific location of the intrusion event is determined. The invention makes full use of the correlation and difference of sensor data under different pulse widths, effectively reduces false alarm rate and missed alarm rate without increasing sensor hardware cost, has simple algorithm and high positioning accuracy.
Description
technical field [0001] The invention relates to the field of optical fiber distributed measurement, in particular to a method for reducing the false alarm rate and missing alarm rate of a phase sensitive optical time domain reflection sensor. Background technique [0002] The phase-sensitive optical time-domain reflectometry sensor is a kind of optical fiber distributed disturbance sensor, which can be sensitive to the disturbance at any point on the sensing fiber and give the location information of the disturbance. Theoretically, it can be measured as a function of optical fiber position information, and replace the traditional sensor array of hundreds of dots with a single optical fiber. The phase-sensitive optical time-domain reflectometry sensor has many advantages such as long monitoring distance, low construction cost, no electromagnetic interference, no need for external power supply, and adapting to complex terrain environments. It is especially suitable for long-di...
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IPC IPC(8): H04B10/071H04B10/079
CPCH04B10/071H04B10/0791
Inventor 钟翔赵世松邓华夏张进马孟超于连栋
Owner 北京博感光科科技有限公司