衰减全反射型电压传感器的理论和实验研究

提出了一种新型反射型聚合物波导电压传感器理论，并且进行了实验研究。这种电压传感器采用棱镜波导耦合结构，在棱镜下底面依次镀有金属膜一聚合物一金属膜三层结构。通过两层金属膜对极化聚合物加电压，利用聚合物材料电光效应和导模共振吸收峰对聚合物折射率的敏感特性，通过反射光强的测量来确定作用电压的变化值。实验中的测试电压范围是从-140V至 140V，得到的线性度值为0．991，电压测量的分辨力为0．1V，电压测量灵敏度系数为0．0011V^-1。实验表明这种电压传感器具有良好的线性和较高的灵敏度。

Theoretical and Experimental Research on Voltage Sensing Based on Attenuated-Total- Reflection

A new type of voltage sensor which uses the prism and symmetrical metal-cladding polymer waveguide configuration has been proposed. The structure consists of a coupling prism and 3-layer film that prepared on the bottom of prism in proper order. The 3-layer films are metal layer, poled polymer, bottom electrode. Owing to the electrooptical effect of the poled polymer, and the sensitive feature of its refractive index to the resonance obsorption peak of the guided mode, the voltage change can be determined through the measurement of the light intensity when applying voltage on the poled polymer. The measurement range of voltage is from -140 V to 140 V in the experiment. The linearity is 0.991. The resolution of voltage measurement is 0.1 V -1. The sensitivity coefficients is about 0.0011 V -1. The experimental results show the fine linearity and the high sensitivity of the proposed voltage sensor.