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基于马赫-曾德尔原理的光纤传感器广泛应用于管道的实时监测中,分析了此类光纤传感器的输出功率随入射光偏振态及光波在长距离光纤传输中偏振态变化的影响。通过Matlab仿真研究了分布式光纤传感系统的偏振衰落,论证了光波传输中的偏振衰落现象对输出条纹的可见度产生了很大的影响。提出了一种利用动态的偏振控制系统对光波偏振态进行控制从而减少偏振衰落的方法,并且展望了改进后的分布式光纤传感器在工业管道的探测领域中具有相当广阔的前景。
The fiber optic sensor based on the Mach-Zehnder principle is widely used in the real-time monitoring of the pipeline. The output power of the optical fiber sensor is analyzed with the polarization state of the incident light and the polarization state of the light wave in the long-distance optical fiber transmission. The polarization fading of distributed optical fiber sensing system is studied by Matlab simulation. It is demonstrated that the phenomenon of polarization fading during the light wave transmission has a great influence on the visibility of the output fringes. A method of using the dynamic polarization control system to control the polarization state of light to reduce the polarization fading is proposed. The improved distributed optical fiber sensor is expected to have a bright future in the field of industrial pipeline detection.