The sensing distance of the traditional phase-sensitive optical time domain reflectometry (Φ-OTDR) distributed optical fiber disturbance sensing system can only reach about 26 km. In order to increase the sensing distance without introducing the new technology and increasing the system cost, a method of processing the data by segmenting thresholds was proposed to increase the system sensing distance to 53.6 km. The locating accuracy is up to 20 m. Considering the impact of noise signal on the system's false alarm problem, a wavelet threshold denoising method based on empirical mode decomposition (EMD) is proposed. Experimental tests show that the method can significantly reduce the noise in the scattering signal and improve the alarm performance of the system.
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