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研究了偏振分集技术消除干涉型光纤传感器中偏振衰落问题的基本原理及实现方法。理论分析表明,偏振二分集可大大缓解偏振衰落。搭建光纤传感系统对偏振二分集技术进行了实验验证,实验中单路最小可视度接近0,而偏振二分集得到的最小可视度为0.4。实验结果表明系统采用的相位载波调制解调技术实现了信号的稳定检测。
The basic principle and implementation of polarization diversity technology to eliminate the problem of polarization fading in an interference optical fiber sensor are studied. Theoretical analysis shows that the polarization of the two diversity can greatly alleviate the polarization fading. An optical fiber sensing system was set up to experimentally verify the polarization two-diversity technique. The minimum visible degree of the single path was close to 0 in the experiment, and the minimum visibility of the polarization two-diversity was 0.4. The experimental results show that the system uses the phase carrier modulation and demodulation technology to achieve a stable signal detection.