Simultaneous Extraction Method of Vibration Signal Position and Frequency in Phase OTDR System

Abstract

The invention discloses a method for simultaneously extracting the position and frequency of a vibration signal in a phase OTDR system. The method includes building a phase OTDR system; collecting data from the phase OTDR system; and collecting the collected continuous backward Rayleigh scattering interference signals Convert it into a matrix; perform Fourier transform on the above matrix to obtain a spectrogram that reflects the vibration position and frequency information at the same time. The method for simultaneously extracting the position and frequency of the vibration signal in the phase OTDR system designed by the present invention can not only quickly extract the position and frequency of the vibration signal in the phase OTDR system at the same time, improve the system signal processing efficiency, but also improve the signal quality. The signal-to-noise ratio of the processing is improved while also improving the spatial resolution for vibration localization.

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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