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针对现有光纤电压传感器结构复杂、调整难度大、温度稳定性差、光功率损耗大及电压引入不便等问题,提出一种基于全偏振态检测且无需起偏器与检偏器的光纤电压传感器.传感器只含有自聚焦透镜、Bi4Ge3O12晶体以及全反射镜等3个主要元件,器件少,结构简单,对准较容易.介绍了全偏振态检测系统光路,采用分振幅法检测偏振态,具有快速响应、算法简单等优点.计算得出了偏振态、离线电场与被测电压之间的公式.进行了悬挂式高压试验,试验中的传感器上无电极,也无需接地,不但省去了昂贵的绝缘子,而且增大了传感器的量程.试验结果表明,在室温条件下0~10kV工频交流电压范围内,该传感器具有良好的线性关系,证明了该结构的可行性.
Aiming at the problems of complex structure, large adjustment difficulty, poor temperature stability, large optical power loss and inconvenient voltage introduction, the existing optical fiber voltage sensor is proposed. An optical fiber voltage sensor based on full polarization detection without polarizer and analyzer is proposed. The sensor contains only three main components such as self-focusing lens, Bi4Ge3O12 crystal and total reflection mirror, and has few components, simple structure and easy alignment. The optical path of the fully polarized state detection system is introduced, the polarization state is detected by the sub-amplitude method, , The algorithm is simple and so on.Computational between the polarization state, the off-line electric field and the measured voltage has been calculated.The hanging high voltage test was carried out, the electrodes in the test had no electrode and no grounding was needed, which not only eliminated the need of expensive insulator , But also increases the range of the sensor.The experimental results show that the sensor has a good linearity in the range of 0 ~ 10kV AC voltage at room temperature, which proves the feasibility of the structure.