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0～10 kV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 some problems of existing optical fiber voltage sensors, such as complex structure, adjustment difficulties, poor temperature stability, optical power loss and voltage introduced inconvenience, a new structure of suspended optical fiber voltage sensor based on all polarization state detection without polarizer and analyzer was proposed. The sensor only contained three main elements that are a selffocusing lens, a Bi4Ge3O12 crystal and a total reflection mirror.For the fewer devices,the structrue is simple and it is easy to align. All polarization state detection system was described. It uses divisionofamplitude method and has fast response and simple algorithm.Formulas about polarization state, electric field and the measured voltage were calculated.Experiment of measuring the high voltage by suspending the sensor was demonstrated. The sensor in the experiment has no electrode and without ground,which eliminates the need for expensive insulators and increases the range of the sensor. The experiment results show that the sensor has a good linearity at room temperature in the range of 0~10 kV AC voltage at powerfrequency,which proves the feasibility of the structure.