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Amplitude demodulation vibration positioning detection method based on double-difference step length

A positioning detection and amplitude technology, applied in measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve problems such as misjudgment, reduce the probability of missed detection, improve calculation efficiency and signal-to-noise ratio effect of dependence

Active Publication Date: 2022-03-25
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

[0004] What the present invention is to solve is the problem of the misjudgment probability of the existing traditional amplitude accumulation difference method, and provides a method for amplitude demodulation vibration location detection based on double difference step size

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  • Amplitude demodulation vibration positioning detection method based on double-difference step length
  • Amplitude demodulation vibration positioning detection method based on double-difference step length
  • Amplitude demodulation vibration positioning detection method based on double-difference step length

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Embodiment Construction

[0032] 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 specific examples.

[0033] see figure 1 , a vibration positioning detection system based on double differential step size demodulation, mainly composed of a laser, a first coupler, an acousto-optic modulator, a signal generator, a circulator, a sensing fiber, a polarization modulator, a second coupler It is composed of device, balance detector and host computer. The output end of the laser is connected to the input end of the first coupler, one output end of the first coupler is connected to one input end of the acousto-optic modulator, and the other output end of the first coupler is connected to one input end of the second coupler. The output end of the signal generator is connected to the other input end of the acousto-optic modulator, the output end of the acousto-optic modulator is con...

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Abstract

The invention discloses an amplitude demodulation vibration positioning detection method based on double difference step lengths, and the method comprises the steps: introducing two different difference step lengths on the basis of a conventional difference accumulation algorithm, and carrying out the accurate design of a first difference step length and a second difference step length, the relation among the vibration signal frequency, the total number of backward Rayleigh scattering signals and the difference step length is fully utilized, the calculation efficiency and the signal-to-noise ratio of the system are effectively improved, the strong dependence of a traditional amplitude difference accumulation algorithm on the detection signal frequency is reduced, and the probability of vibration signal leak detection is reduced.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a method for amplitude demodulation vibration location detection based on double-difference steps. Background technique [0002] Phase-sensitive time-domain reflectometry (φ-OTDR), based on backscattered Rayleigh light from highly coherent probe pulses, has high sensitivity and can detect weak vibration events over tens of kilometers of sensing fibers. Therefore, φ-OTDR has attracted more and more attention in many fields such as structural health monitoring, traffic monitoring, intrusion detection, and pipeline monitoring. In all φ-OTDR applications, detecting and locating vibrations with high reliability and low false alarm probability is a fundamental task. In the case of no fiber vibration, the phase and amplitude of the RBS (Rayleigh back scattering) at each spatial sampling point on the sensing fiber do not change significantly. On the contrary, when the sen...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 秦祖军陈聪高江江张文涛熊显名
Owner GUILIN UNIV OF ELECTRONIC TECH
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