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针对低双折射光纤双光束干涉型传感器两臂偏振态随机变化引起的信号衰落 ,提出了一种新型消偏振方式 ,它可以在可见度略有下降的情况下 ,较好地消除偏振态变化引起的干涉信号可见度的随机变化。该方案是通过相互正交的两个偏振态来补偿由于其中一个偏振态变化导致的干涉信号衰落。通过自动增益控制电路可以使传感信号稳定 ,能够在信噪比有所下降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 random change of polarization state of two arms of low birefringence optical fiber dual-beam interference sensor, a new depolarization method is proposed, which can eliminate the change of polarization state well with a slight decrease of visibility Random change of visibility of interference signal. The solution is to compensate the interference signal fading caused by the change of one of the polarization states by two orthogonal polarizations. Through the automatic gain control circuit can make the sensing signal is stable, can reduce the impact of polarization fading when the signal to noise ratio is decreased, to achieve the depolarization fading of the interference type optical fiber sensor