Distributed fiber sensing disturbance event detection method and apparatus

A distributed optical fiber, event detection technology, applied in measurement devices, measurement of ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problem of large false alarm rate of the system, achieve high detection probability, solve the problem of large false alarm rate of the system, reduce The effect of false positive rate

Active Publication Date: 2018-07-20
武汉光谷航天三江激光产业技术研究院有限公司
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Problems solved by technology

[0005] The embodiment of the present invention provides a distributed optical fiber sensing pipeline disturbance event detection method and device, which solves the technical problem in the prior art that the false zero crossing causes a high false alarm rate in the system, effectively eliminates interference, and greatly reduces false alarms rate, to achieve the technical effect of higher detection probability

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  • Distributed fiber sensing disturbance event detection method and apparatus
  • Distributed fiber sensing disturbance event detection method and apparatus

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Embodiment 1

[0024] Such as figure 1 As shown, the present invention provides a method for detecting a disturbance event in a distributed optical fiber sensing pipeline, the method comprising:

[0025] Step 110: Preprocessing the acquired optical fiber sensing signal to obtain the first signal;

[0026] Further, the preprocessing of the acquired optical fiber sensing signal specifically includes: filtering the acquired optical fiber sensing signal for noise reduction.

[0027] Specifically, the distributed optical fiber sensor obtains the optical fiber sensing signal. The distributed optical fiber sensor is a sensor that uses a unique distributed optical fiber detection technology to measure or monitor the spatial distribution and time-varying information along the optical fiber transmission path. It arranges the sensing fiber along the field, and can obtain the spatial distribution and time-varying information of the measured field at the same time, which is attractive for many industria...

Embodiment 2

[0046] Such as figure 2 As shown, the present invention provides a distributed optical fiber sensing pipeline disturbance event detection device, said device comprising:

[0047] pipeline 102;

[0048] Specifically, the pipeline 102 is used for transporting liquid, gas or loose solid. Such as oil pipelines, natural gas pipelines and other pipelines. Such as figure 2 As shown, the embodiment of the present application takes the pipeline laid below the ground surface 104 as an example for explanation, but the present application is not limited to laying the pipeline below the ground surface 104 , and can also be laid above the ground surface 104 .

[0049] Distributed optical fibers, the distributed optical fibers 106 are laid in parallel along the pipeline 102;

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Abstract

The invention provides a distributed fiber sensing disturbance event detection method and apparatus. The distributed fiber sensing disturbance event detection method includes the steps: preprocessingobtained fiber sensing signals, and obtaining a first signal; according to the first signal, obtaining a second signal, wherein the second signal is a windowing signal; according to the second signal,calculating the short time energy and the corrective zero-crossing rate of the second signal; according to the mean value of the short time energy and the zero-crossing rate of the second signal, obtaining a reference standard deviation; and comparing the short time average energy of a disturbance signal to be detected and the zero-crossing rate standard deviation with the reference standard deviation, so as to determine whether disturbance exists. The distributed fiber sensing disturbance event detection method and apparatus have the advantages of effectively rejecting interference, greatlyreducing the rate of false alarm, achieving the technical effect with relatively higher detection probability, and solving the technical problem that false zero-crossing causes large rate of false alarm of the system.

Description

technical field [0001] The invention relates to the technical field of signal detection, in particular to a method and device for detecting a disturbance event of a distributed optical fiber sensing pipeline. Background technique [0002] As my country's energy demand increases, the scale of oil and gas pipeline construction increases accordingly. Once an accident occurs along the pipeline, it will not only cause huge losses to the pipeline transportation system and industrial production, but also have a serious impact on society and the natural environment. Many factors, including man-made damage and natural disasters, make pipeline inspection more important. [0003] However, in the process of realizing the technical solution of the invention in the embodiment of the present application, the inventor of the present application found that the above-mentioned technology has at least the following technical problems: [0004] In the prior art, the short-term zero-crossing ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 王重阳邱秀分宋聪孙志伟
Owner 武汉光谷航天三江激光产业技术研究院有限公司
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