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实验研究基于石英晶体的光学电压传感特性,包括不同光轴偏转角和检偏器角度对传感器输出信号的影响。光学传感单元包括1块石英晶体和2个偏振器,当所用石英晶体的尺寸为6 mm×6 mm×23 mm,工作光源波长为1 550 nm时,晶体的光轴偏转角可选取约为4°,且检偏器角度可选取约为15~25°,此时可获得相对较大的电压测量灵敏度和线性测量范围。实验测量125 V~4.5 k V范围内的工频电压,电压测量灵敏度约为0.294 V/k V,实验数据的非线性误差低于0.21%。
Experimental studies are based on the optical voltage sensing characteristics of quartz crystals, including the effects of different optical axis deflection angles and analyzer angles on the sensor output signal. The optical sensing unit includes a quartz crystal and two polarizers. When the size of the used quartz crystal is 6 mm × 6 mm × 23 mm and the working light source wavelength is 1 550 nm, the optical axis deflection angle of the crystal can be selected to be about 4 °, and the analyzer angle can be selected about 15 ~ 25 °, at this time you can get a relatively large voltage measurement sensitivity and linearity measurement range. The experimental measurement of power frequency voltage in the range of 125 V ~ 4.5 k V, the voltage measurement sensitivity of about 0.294 V / k V, the nonlinear error of the experimental data is less than 0.21%.