A distributed optical fiber vibration sensing positioning method and device based on pulse accumulation

A distributed optical fiber and vibration sensing technology, which is applied in measuring devices, instruments, and using wave/particle radiation, etc., can solve problems such as wind disturbance and interference of optical cables, and achieve manpower saving, enhanced amplitude strength, and high availability. Effect

Active Publication Date: 2021-08-17
郑州信大先进技术研究院
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Problems solved by technology

[0006] The purpose of the present invention is to address the deficiencies of the prior art, thereby providing a distributed optical fiber vibration sensing positioning method based on pulse accumulation, without changing the hardware equipment and optical cable, the existing demodulation method can solve the disturbance of the optical cable with the wind interference problems

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  • A distributed optical fiber vibration sensing positioning method and device based on pulse accumulation
  • A distributed optical fiber vibration sensing positioning method and device based on pulse accumulation
  • A distributed optical fiber vibration sensing positioning method and device based on pulse accumulation

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Embodiment Construction

[0036] The technical solutions of the present invention will be described in further detail below through specific implementation methods.

[0037] The distributed optical fiber vibration monitoring system mainly includes two monitoring systems based on intensity demodulation and phase demodulation. Both systems can use the positioning method described in the present invention when positioning the vibration position. In this embodiment, the phase demodulation system ( φ-OTDR) as an example to introduce the positioning method described in the present invention in detail.

[0038] Such as figure 1 As shown, a distributed optical fiber vibration sensing positioning method based on pulse accumulation includes the following steps:

[0039] S1, collecting multiple pulse data strings output by the photodetector, where the pulse data strings are a collection of several return data collected under a single emission pulse.

[0040] The number of the return data corresponds to the prop...

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Abstract

The invention provides a distributed optical fiber vibration sensing positioning method based on pulse accumulation, which includes the following steps: collecting and accumulating pulse data output by photoelectric detectors, calculating the amplitude data of each pulse data, and sequentially performing time difference processing on the amplitude data and superposition processing, and judge the intrusion location according to the superposition amplitude after superposition processing. The present invention also provides a distributed optical fiber vibration sensing and positioning device based on pulse accumulation, which is used to implement the aforementioned positioning method. The present invention performs differential processing on the received pulse data, and performs data accumulation on the differentially processed pulse data, so as to suppress the vibration signal caused by the optical cable disturbance caused by the strong wind, and increase the amplitude strength of the intrusion vibration signal, and improve the The correct rate of discrimination of intrusion behaviors under conditions such as strong winds and cars passing by has high usability in engineering applications.

Description

technical field [0001] The invention relates to the field of distributed optical fiber vibration sensing, in particular to a distributed optical fiber vibration sensing positioning method and device based on pulse accumulation. Background technique [0002] The distributed optical fiber vibration sensing system is composed of long-distance distributed detection optical fiber arranged at the front end, optical fiber demodulation host, and host computer software. The system uses a laser source and an acousto-optic modulator to continuously inject pulsed light into the detection fiber, and receives the back Rayleigh scattered light containing the vibration or sound signal after the detection of the vibration or sound wave signal in the sensing fiber. The sensor and acquisition card transmit the signal to the host computer for data processing, and finally demodulate the vibration information. The distributed optical fiber vibration sensing system performs all-day, all-weather l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 邵佳杨纳川刘正堂牛原野袁航王永华赵翠霞
Owner 郑州信大先进技术研究院
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