Alarm sensing system for distributed optical fiber oil and gas pipeline

The present invention belongs to the alarm technical field for the optical fiber oil and gas pipeline, and provides an alarm sensing system for distributed optical fiber oil and gas pipeline. The technical proposal of the invention is that: the coherent light emitted from the high coherent length tunable laser enters the input end a of the optical circulator through the sensing optical fiber, outputs to the optical fiber raster reflector entering from the first output end b of the optical circulator and the antiradar reflectivity optical fiber raster reflector, then returns to the optical circulator, outputs to the photodiode by the second output end c of the optical circulator. The signals of the photodiode is magnified by the amplifier and then analyzed the required information by the FFT sideband filter and the spectrum analyzer, finally displayed and prewarned by the computer control system and the prewarning. The invention is mostly used in the alarm sensing system for distributed optical fiber oil and g