Improving thermal stability of LiNbO_(3)based electro-optical electric field sensor by depositing a TiO_(2)film
作者机构：Department of Electrical EngineeringTsinghua UniversityBeijingChina Tianfu New Area Power Supply CompanyState Grid of Sichuan Electric Power CompanyChengduChina State Key Lab of Power SystemsTsinghua UniversityBeijingChina International Joint Laboratory on Low Carbon Clean Energy InnovationTsinghua UniversityBeijingChina
出 版 物：《High Voltage》 (高电压（英文）)
年 卷 期：2022年第7卷第5期
页 面：840-846页
核心收录：
学科分类：0808[工学-电气工程] 08[工学] 080202[工学-机械电子工程] 0802[工学-机械工程]
基 金：State Grid Corporation of China Grant/Award Number:52120519000M。
摘 要：Electro-optic electric field sensors based on LiNbO3 are widely used for the measurement of electric fields or transient voltages.However,the working bias of the sensor is influenced by the temperature due to the thermo-optic effect of LiNbO_(3).An athermal electrooptic electric field sensor was demonstrated by coating a thin layer of TiO_(2)film which has a negative thermo-optic coefficient,on the common-path interferometer based sensor to compensate LiNbO_(3) s positive thermo-optic coefficient.Both calculation and experimental studies were conducted.The experimental results reasonably agree well with the calculated values,and the results show the sensor coated with a 640 nm thick TiO_(2)film has a much smaller temperature dependence of 0.011°/℃compared to the initial value of 0.1°/℃.
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