Fiber sensing method and system based on light quantum inversion

The invention provides a fiber sensing system based on light quantum inversion; the system comprises a pulse laser, a wavelength division multiplexer, an APD module, a 1*4 optical switch, a sensing fiber and a signal processing module; the pulse laser is connected with the input end of the wavelength division multiplexer; the sensing fiber is connected with the COM end of the wavelength division multiplexer; two output ends of the wavelength division multiplexer are respectively connected with the input end of the dual-channel APD module; the APD module output ends are respectively connected with the signal processing module. The fiber sensing method and system can reduce the temperature measurement system noise intakes, can improve the signal to noise ratio, thus improving the fiber sensing distance and temperature measurement precision. 本发明提出种基于光量子反演的光纤传感系统，包括：脉冲激光器、波分复用器、APD模块、1×4光开关、传感光纤和信号处理模块；其中，脉冲激光器与波分复用器的输入端相连，传感光纤与波分复用器的COM端相连，波分复用器的两个输出端分别接双通道APD模块的输入端，APD模块输出端分别连接到信号处理模块。利用本发明，可以减少测温系统的噪声引入量，提高信噪比