针对低双折射光纤双束干涉型传感器两行偏振态随机变化引起的信号衰落，提出了一种新型干涉型光纤传感器的消偏振衰落方案。通过在光纤干涉仪的输出端加对光波偏振态适当的高频调制．可以使干涉信号幅度波动小于４．７ｄＢ或６．３ｄＢ（与调制信号的形式有关），通过自动增益控制电路或将输出信号除以可见度的方式，能够在信噪比有所降低的情况下消除偏振衰落的影响，实现干涉型光纤传感器的消偏振衰落。 Aiming at the signal fading caused by the random change of polarization states of two lines of low birefringence fiber double-beam interference sensor, a new depolarization fading scheme of interference fiber sensor is proposed. By adding an appropriate high frequency modulation of the light polarization at the output of the fiber optic interferometer. Interference signal amplitude fluctuations can be less than 4.7dB or 6.3dB (with the modulation signal form), through the automatic gain control circuit or the output signal divided by the visibility of the way, can be reduced in the signal to noise ratio decreased Polarization fading effect, to achieve interference-type optical fiber sensor depolarization fading.