Solar-Blind Ultraviolet Catadioptric Zoom Optical System Design

High voltage transmission line of the electric power system in modern time will use a lot of insulation coating,when insulation coating performance began to decline will produce a series of discharge,the discharge will be accompanied by radiation from 240-280 nm.use ultraviolet imaging lens can detect the leakage of electric power system on failure position,further to prevent safety accidents,and ensure the operation of the electric power system in good condition.Solar-blind ultraviolet imaging technology have advantage of fast recognition speed,high accuracy and strong durability over the leakage of the electric power system.Therefore,this paper designs a multi-focal solar-blind ultraviolet imaging optical system.The zoom lens can change the focal within a certain range to obtain the different size of field angle,so as to detect the discharge conditions of the electric power system in different position.This paper studied the research progress of corona detection imaging technology in domestic and overseas,the paper introduce the principle of corona detection and corona detection imaging technology,also introduce structure and working principle of the zoom optical system.Based on the above theoretical,use Zemax software to design a multi-focal solar-blind ultraviolet imaging lens,of which the focal length is100-200 mm,the pupil diameter is 60 mm,the zoom ratio is 2,the lens all adopt he spherical mirror,the system has good manufacturability,compact structure and short length,the image quality is good.Finally,the tolerance analysis of the optical system shows that the tolerance is reasonable and conforms to the actual production and processing requirements.