为了实现静电电压表的精确测量，提出了一种基于等应变梁和光纤布拉格光栅（FBG）的静电电压传感器。在一定温度范围内，由双FBG 的结构方案实现了传感器的温度自补偿，通过对等应变梁的仿真分析和传感器系统的电场仿真，优化设计和制备了传感器结构系统。利用一对平板电极产生匀强电场，在静电力作用下等应变梁上的导体半球受力致使等应变梁发生变形，使得两个FBG 反射光谱的中心波长产生偏移，通过FBG 的波长差实现了电压的测量。实验结果表明：该传感器可实现5~24 kV 直流(DC)高压和交流(AC)高压有效值的测量，5~12 kV 的计算精度为2.1%，12~24 kV 的计算精度为0.89%，传感曲线的拟合度为0.99985，基本满足高电压测量系统的稳定可靠、精度高、抗干扰能力强等要求。

In order to achieve high precise measurements of electrostatic voltmeter, an electrostatic voltage sensor of fiber Bragg grating (FBG) based on uniform strain beam is proposed. It can achieve temperature selfcompensation of sensor by twin- FBG structure scheme in a special temperature range; the sensor structure system is optimumly designed and prepared by simulation analysis of uniform strain beam and simulation on electric field of sensor system. Uniform electric field is produced using a pair of plate electrode, conductor hemisphere is forced under the pull of electrostatic force and the shape of uniform strain beam is deformed, causing central wavelength of twin- FBG reflection spectrum shift, and realizing the voltage measurement by wavelength difference of FBG. The experimental results show that the sensor can measure direct current (DC) and alternating current (AC) root- mean- square voltages from 5 kV to 24 kV. Moreover, the measurement accuracy is 2.1% from 5 kV to 12 kV and 0.89% from 12 kV to 24 kV, and the fitting degree of the sensing curves is 0.99985. The sensor satisfies the requirement of high stability and high reliability, high precision and strong anti-interference ability and so on.