A distributed optical fiber pipeline leakage detection and location technology based on Sagnac optical fiber interferometer is studied.The single mode optical fiber is used to build up the distributed sensor

the leak signals can be detected efficiently

and the leak positions can be located.The principle and the result of the detection system are introduced

and location method is also analyzed.The wavelet threshold denoising method is used to analyze the leak signals

and the identification of the null spectrum can be improved effectively.The results verify that the detection technology has high measurement sensitivity and location precision.