摘要
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 ,提出的一种新型消偏振方式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 ,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 ( AGC)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 。
A new depolarization mode that can eliminate polarization-induced a random variation of the signal visibility under the small reduction in visibility is proposed in accordance with fiber low double-refracting and double-beam interferometric sensor. The two polarization states are mutually normal. The scheme is carried out through recovering the one that its variation causes the interference signal fading. The sensing signal can be stable, the influence of the polarization-induced fading can be eliminated under the small reduction in signal-noise ratio, and the polarization-induced fading eliminating for the interferometric optic fiber sensor can be carried out through automatic gain control circuit.
出处
《光电工程》
EI
CAS
CSCD
北大核心
2001年第3期25-28,共4页
Opto-Electronic Engineering
基金
国家自然科学基金资助项目 (6970 2 0 0 3 )
