Mach-Zehnder光纤传感系统在实际应用中受偏振相位偏移现象影响,使得信号相关性不稳定,造成定位时出现粗大误差,甚至无法定位的问题。为解决这一问题,提出了一种基于双臂检测信号相关系数的遗传偏振控制算法。利用偏振控制器对输入光的偏振态进行实时控制,在系统信号相关性恶化时,通过改变输入偏振态,恢复信号的相关性。实验证明,该算法可使检测信号维持良好的相关性,系统的稳定性得到较大提高。 In practice, the Mach-Zehnder fiber sensing system is affected by the phenomenon of polarization phase shift, which makes the signal correlation unstable, resulting in coarse errors in positioning, or even positioning problems. To solve this problem, a genetic polarization control algorithm based on the correlation coefficient of the two arms detection signal is proposed. The polarization controller is used to control the polarization state of input light in real time. When the correlation of the system signal is deteriorated, the correlation of the signal is recovered by changing the input polarization state. Experiments show that the algorithm can make the detection signal maintain a good correlation, the stability of the system is greatly improved.