Method for simultaneously extracting position and frequency of vibration signal in phase OTDR system

Abstract

The invention discloses a method for simultaneously extracting the position and the frequency of a vibration signal in a phase OTDR system. The method comprises the steps that the phase OTDR system is set up; data collection is carried out on the phase OTDR system; collected continuous backward rayleigh scattering interference signals are converted into a matrix; Fourier transformation is carried out on the matrix to obtain a spectrogram which reflects the vibration position and frequency information at the same time. According to the method for simultaneously extracting the position and the frequency of the vibration signal in the phase OTDR system, the position and the frequency of the vibration signal in the phase OTDR system can be rapidly extracted out at the same time, the system signal processing efficiency is improved, the signal processing signal-to-noise ratio is improved, and meanwhile the spatial resolution for vibration positioning is improved.

Description

technical field [0001] The invention relates to a method for extracting vibration signals, in particular to a method for simultaneously extracting the position and frequency of vibration signals in a phase OTDR system. Background technique [0002] As a distributed optical fiber sensing system, the phase OTDR (Phase Sensitive Optical Time Domain Reflectometer) system has the characteristics of anti-electromagnetic interference, corrosion resistance, high positioning accuracy, and multi-point detection. In terms of real-time remote dynamic monitoring of vibration and vibration, it has the advantages that traditional sensors cannot replace. [0003] In the phase OTDR system, how to extract the information about the position and frequency of the vibration signal from the collected back Rayleigh scattering interference signal has always been the focus of research. The commonly used method of extracting the vibration position and frequency is to perform sliding average de-noisin...

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Problems solved by technology

[0004] The problem to be solved by the present invention is to provide a method for simultaneously extracting the position and frequency of the vibration signal in a phase OTDR system, which can quickly and simultaneously extract the position and frequency information of the vibration signal in the phase OTDR system, which solves the problem of the position and frequency of the vibration signal in the past. Frequency information can only be extracted separately and takes a long time to extract

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