Study on interference distributed fiber-optic technology for long gas pipeline multi-leak location and detection

Aim at exist interference distributing fiber-optical long gas pipeline leak detection system in multi-leak location and detection aspect´s defect, via derive multi-leak sense signal expression, simulation assay of leak signal spectrum, finding a sort of two leakage points signal spectrum analytical method and positioning system. Simulation experimental result indicating, this analytical method in position to validity distinguish single-point with two leaks fiber-optical sense signal spectrum, two leakages relative positioning error less than 9.99% of total length for 50 km long gas pipeline, thereby for long gas pipeline single channel multi-leak point detection with localization offer a sort of technical basis.