The phase-sensitive optical time-domain reflectometry(Φ-OTDR)distributed vibration sensing system requires a recognition algorithm to identify regular vibration signals from random noise in order to locate the vibration source.The traditional wavelet direct reconstruction algorithm has only been applicable for the identification of known frequency vibration signals.The acquired backscattered Rayleigh signals are now subject to complete wavelet decomposition and hierarchical reconstruction within the measurable frequency range,followed by dynamic threshold-based signal determination.Experi-mental results demonstrate that this method can successfully identify unknown frequency signals within the measurable frequency range,particularly able to distinguish very low-frequency vibrations,and the time consumption is comparable to the Moving Average-Moving Difference algorithm.
关键词
相敏光时域反射/小波降噪/移动差分-移动平均算法/信号识别
Key words
Φ-OTDR/wavelet noise depressing/moving average moving difference algorithm/signal recognition
维普
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