输入偏振态控制的光纤传感器复用系统的研究

The Study of Input Polarization Control Scheme for Multiplexing of Polarization-insensitive Fiber Optic Interferometric Sensors

提出了在干涉型光纤传感器复用系统中将各传感器的最佳输入偏振态反馈控制信息叠加用于复用系统最佳输入偏振态控制的方案 ,并对复用系统中各单元最佳输入偏振态的较差分布时的控制效果进行了理论分析。对达到这一较差分布的概率进行了计算。研究表明 ,该方案简单可行。经过信号处理能使各个光纤传感器在降低信噪比的情况下使干涉仪的输出信号的可见度为 1,从而消除了复用系统中各单元的偏振衰落。

A novel scheme is present to control the optimum input polarization of the interferometric fiber optic arrays by the sum of each sensor’s feedback signal,the minimum visibility of the element in the array under control is calculated and the probability to reach the situation is estimated.The research results show that the scheme is both simple and feasible.Each sensor’s visibility can arrive at 1 by signal process,which eliminates the polarization induced fading(PIF)in each sensor of the sensor array.