Real-time monitoring of flammable and explosive gas pipeline networks is of great significance for ensuring the safety of life and property. Although the optical fiber sensing technology has achieved theoretical research results in the field of monitoring pipeline leakage recently, the practical applicability of theoretical results has not been noticed. This paper analyzes the research progress of pipeline leak detection technology based on optical fiber sensing technology firstly and proposes an algorithm for monitoring gas pipeline leakage based on distributed optical fiber acoustic sensing(DAS) system. The algorithm can obtain the time domain signal characteristics of pipeline leakage to identify leaks, locate the leak points through frequency domain. Experiments show that the algorithm can identify pipeline leakage and locate leaks, the Signal to noise ratio (SNR) and correlation coefficient can be increased to 18.28 and 0.75 respectively. The accuracy of identifying pipeline leakage and locating the pipeline leak points is effectively improved. INDEX TERMS Pipeline leakage, DAS, time domain, frequency domain, identify pipeline leakage and locate leaks.

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