设计了一种利用铌酸锂作为波导基片的双面金属包覆平板光波导, 利用波导中超高阶导模高敏感特性制成了 一种反射型光学电压传感器。入射激光束采用小角度入射,当光波导处于导模共振状态时,选择一个恰当的 工作点,再通过两金属电极对该器件施加直流电压,通过检测反射光强,获得相应的电压值变化。实验测量 中所用的电压范围是 -800～800 V, 得到的线性度值为0.995, 波导反射光的反射率变化灵敏度为0.2% V-1, 实验表明这种电压传感器具有较好的 线性和灵敏度,该新型电压传感器具有结构与制作简单、调节方便和成本低廉等优点。

A new type of voltage sensor employing a symmetrical metal-cladding optical waveguide structure is proposed which utilized the sensitive property of ultrahigh-order modes of the metal-cladding optical waveguide. The voltage change can be determined by measuring the reflected light intensity when a direct voltage is applied to two electrodes to modulate the reflected light intensity through the refractive index change of LiNbO3 . The measurement range of voltage is from -800 V to 800 V with linearity of 0.995. The sensitivity coefficient of reflectivity light intensity is about 0.2% V-1. The results show that the voltage sensor has good linearity and high voltage sensitivity. And it has advantages of easy operating and cheap building up in measurement.