基于白光干涉的光缆无损伤识别方法

摘要

提出一种基于白光干涉的光缆无损伤识别方法.将光纤的两端环接,入射光波经耦合器分成两束光,以相反的方向在同一根光纤中传播,用探测器接收另一端产生的信号.在外加作用力下,对并列在一起的两根光纤产生的光程变化进行了理论分析,推导出光缆识别系统输出信号的理论表达式,对系统输出的信号进行了仿真计算.分别利用冲击信号、正弦信号、音乐信号作为外加信号测得输出信号,进行频谱分析,并与输人信号进行对比,验证该方法的可行性.%A method of the lossless identification for fiber cable based on white-light interference is studied.When the two ends of fiber-optic are connected, the light-wave is coupled into two beams of light with the same light intensity and transmit in the opposite directions. Detector receives signals generated by the other side. The two optical fibers side by side with the force of outside and the optical fiber path changes are analyzed. The output signals on some conditions are simulated and verified by experiment. The impact signal, the sinusoidal signal with a known frequency and the music signals are used as the divided external signal source,and the output signal is observed. By analyzing the spectral, and comparing with the input signal, this method of the lossless identification system is proved feasible.