High-performance distributed fiber sensing system based on EHZ ultrafast pulse scanning

摘要

This application provides a kind of high-performance distributed optical fiber sensor-based systems based on the scanning of Ai Hezi ultrafast pulse, when carrying out disturbing signal test, the interior variable-frequency pulse light that Ai Hezi ultrafast pulse scan laser issues enters sensor fibre through circulator, the backward Rayleigh scattering signal that sensor fibre issues enters non-equilibrium Michelson fiber-optic interferometer by coupler, by the arm length difference for designing two interfere arms, interfere the backward Rayleigh scattering light of two neighboring interference arm length difference position one by one, in this way, it just include phase signal caused by the external disturbance signal on sensor fibre in signal received by after non-equilibrium Michelson fiber-optic interferometer, finally, the relative phase difference signal is demodulated using phase-demodulation unit to change with time, and then it may be implemented to measure the dynamic of disturbing signal in sensor fibre.Meanwhile using Ai Hezi ultrafast pulse scan laser, it can be effectively realized in long range, high-frequency band signals and high spatial resolution while being monitored.