Distributed optical fiber acoustic wave anomaly detection method and device

The invention relates to the field of distributed optical fiber sensing, in particular to a distributed optical fiber acoustic wave anomaly detection method and device. The method mainly comprises the following steps: acquiring an X-state electric signal and a Y-state electric signal which are obtained by mixing an RBS optical signal from a chirp optical pulse with reference light, and acquiring an intensity electric signal of the RBS optical signal; obtaining a phase curve along the distributed optical fiber according to the X-state electric signal and the Y-state electric signal, and obtaining an intensity curve according to the intensity electric signal; and inputting the phase curve into a convolutional neural network to obtain a vibration characteristic, inputting the intensity curve into a multi-layer sensor module to obtain a fading characteristic, fusing the vibration characteristic and the fading characteristic, inputting the fused vibration characteristic and fading characteristic into a judgment mo