基于聚焦激光的场致二次谐波效应电场测量及影响因素研究  

Research on the Electric-field Measurement Method and Influencing Factors of Electric-field Induced Second Harmonic Effect Based on Focused Laser

作　　者：张延泽 陈小月 罗钦一 詹皓予 秦鹏程 蓝磊[1,2] ZHANG Yanze;CHEN Xiaoyue;LUO Qinyi;ZHAN Haoyu;QIN Pengcheng;LAN Lei(School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China;State Key Laboratory of Power Grid Environmental Protection,Wuhan 430072,China;State Grid Hunan Electric Power Company Limited Economic&Technical Research Institute,Changsha 410007,China)

机构地区：[1]武汉大学电气与自动化学院,武汉430072 [2]电网环境保护全国重点实验室,武汉430072 [3]国网湖南省电力有限公司经济技术研究院,长沙410007

出　　处：《高电压技术》2025年第4期1684-1695,共12页High Voltage Engineering

基　　金：国家自然科学基金(52277159)。

摘　　要：鉴于非介入式及高时空分辨率的优点,基于场致二次谐波效应的电场测量方法近年来在气体放电与等离子体诊断等领域受到了广泛关注。基于基频激光空间分布特性,理论推导了二次谐波强度的完整表达式,结合搭建的场致二次谐波效应电场测量平台,讨论了基频激光光功率与偏振方向、电场空间分布及作用区域长度、瑞利长度等因素对二次谐波强度的影响,并分析了温、湿度对二次谐波强度的影响规律。理论上,产生的二次谐波几乎不随湿度变化,但可能由于高湿空气对二次谐波的散射导致实测值随湿度增大而降低。在20~30℃范围内温度对二次谐波强度影响较小,理论值和实测值均随温度增加而略有增大,且实测值增幅大于理论值。In view of the advantages of non-intrusive and high spatial and temporal resolution,the electric field measurement method based on the electric-field induced second harmonic(E-FISH)effect has attracted wide attention in the fields of gas discharge and plasma diagnosis in recent years.Based on the spatial distribution characteristics of the fundamental frequency laser,the complete expression of the second harmonic intensity is theoretically deduced.Combined with the constructed electric field measurement platform based on the E-FISH effect,the effects of optical power and polarization direction of the fundamental frequency laser,electric field spatial distribution and the length of the action region,Rayleigh length and other factors on the intensity of the second harmonic are discussed,and the influence law of temperature and humidity on the intensity of the second harmonic is analyzed.Theoretically,the generated second harmonic hardly varies with humidity,whereas,the measured values may decrease with increasing humidity due to the scattering of the second harmonic by high humidity air.The temperature has less effect on the second harmonic intensity in the range of 20~30℃.Both theoretical and measured values increase slightly with the increase of temperature,and the increase of measured values is larger than the theoretical values.

关 键 词：电场测量 场致二次谐波效应 电极长度 瑞利长度 温度 湿度 

分 类 号：O539[理学—等离子体物理]