用于电晕检测的日盲紫外成像系统设计  

Design of a Solar-blind Ultraviolet Imaging System for Corona Detection

作　　者：陈塑淏 吕博[1] 刘伟奇[1] 冯睿[1] 魏忠伦[1] CHEN Suhao;LÜBo;LIU Weiqi;FENG Rui;WEI Zhonglun(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所,长春130033 [2]中国科学院大学,北京100049

出　　处：《光子学报》2022年第9期355-364,共10页Acta Photonica Sinica

基　　金：高分专项装备预研项目(No.GFZX0403260206)。

摘　　要：在对高压电晕放电进行监测时,为了扩大成像系统的检测范围,提升检测精度,设计了一款大视场大相对孔径高分辨率的日盲紫外成像系统。该系统采用反远距的结构形式,使用12片标准球面镜片,光学总长为90 mm,系统全视场角为56°,相对孔径为1/2。系统工作波长为240~280 nm,在全视场范围内,畸变小于2.2%,相对照度大于70%,系统的在110 lp/mm的空间频率处调制传递函数大于0.65,为之后的公差分配和热差校正留有足够空间。计算了由温度变化引起的热离焦,根据离焦量,利用被动式机械补偿法对系统的热差进行校正,补偿后的系统在−20~60℃的温度范围内调制传递函数均大于0.4,实现了无热化设计。最后,通过合理的公差分配及分析,加工装调后的系统仍有较高的成像质量,满足电晕检测的实际使用需求。During real-time monitoring of high voltage corona discharge,the solar radiation intensity is much higher than the radiation generated by corona discharges,which will interfere with the detection process.However,due to the absorption of the earth's ozone layer,the radiation intensity of the sun's radiation to the ground becomes very weak in the solar-blind ultraviolet band of 240~280 nm.Observing high-voltage wires in this band can reduce the interference of the environment,thereby improving the imaging contrast and reducing the false detection rate.In order to expand the detection range and improve the detection accuracy of the solar-blind UV imaging system,the optical system needs to have a higher resolution while ensuring a larger field of view.In this paper,a solar-blind ultraviolet optical system with a large field of view,large relative aperture and high resolution is designed.We have formulated the design index according to user needs,and selected an anti-telephoto lens as the initial structure according to the design index requirements.During optimization,we first replaced the lens material with fused silica and calcium fluoride materials commonly used in the ultraviolet band.According to the principle of chromatic aberration correction,the positive lens is replaced by calcium fluoride with a large Abbe number,and the negative lens is replaced by fused silica with a small Abbe number.The refractive index of these two materials is low and the Abbe number difference is small in the solar-blind ultraviolet band,which is not suitable for chromatic aberration correction,and the typical achromatic structure doublet lenses can not transmit ultraviolet radiation,so we added two sets of double separation structures to correct chromatic aberration.Due to the high requirements for the surface roughness of the lens in the ultraviolet band,the limitation of materials and apertures,and the consideration of technological difficulty,no aspherical lens was introduced in this design.The final design uses 12 standard spheri

关 键 词：应用光学 日盲紫外 光学设计 无热化设计 成像系统 

分 类 号：O435[机械工程—光学工程]