激光与光电子学进展, 2014, 51 (10): 102201, 网络出版: 2014-09-22
“日盲”紫外电晕检测变焦光学系统设计 下载: 656次
Design of“Solar Blind”Ultraviolet Zoom Optical System Used in Corona Detection
成像系统 “日盲”紫外 电晕检测 变焦光学系统 调制传递函数 畸变 imaging system “solar blind”ultraviolet corona detection zoom optical system modulation transfer function distortion
摘要
基于电晕检测过程中要求紫外光学系统大视场搜索、小视场探测的需求,针对工作波长范围为0.24~0.28 μm 的日盲区紫外波段,设计了“日盲”紫外机械补偿变焦光学系统。根据用户要求,其焦距为30~60 mm,F 数为3.5,选用PIXIS型1024BUV 1 inch(1 inch=2.54 cm)紫外CCD,像元尺寸为13 μm ×13 μm ,对应视场为8°~16°。系统由8 片透镜组成,引入两个非球面,使系统具有结构简单、成本低等优点。像质评价表明,在截止频率38 lp/mm 处,各视场的光学调制传递函数均在0.7 以上,接近衍射极限,畸变小于3%,在整个变焦范围内像质优良,满足用户总体设计的要求。
Abstract
According to the requirements of corona detection on searching targets with large field of view and detecting objects with small field of view, a refractive zoom optical system using mechanical compensation technology and working at“solar blind”ultraviolet wavelength (0.24~0.28 μm ) is designed. According to the requirements of users, the focal length spreads from 30 mm to 60 mm, and F number is 3.5. PIXIS 1024BUV CCD with size of 1 inch (1 inch=2.54 cm) and pixel size of 13 μm ×13 μm is used as a sensor. The field of view of the system is 8°~16°. The zoom lens consists of eight lenses with two aspherical surfaces, so it has the advantages of low cost and simple structure . The design results show that the modulation transfer function (MTF) of the zoom system is higher than 0.7 at cut off frequency of 38 lp/mm. The optical performance at all fields of view and all zooming conditions is close to the diffraction- limited image, and the distortion is less than 3% . So the zoom optical system presents a good image quality, and can meet users′ requirements.
张鸿佳, 马军, 朱海宇, 王文生. “日盲”紫外电晕检测变焦光学系统设计[J]. 激光与光电子学进展, 2014, 51(10): 102201. Zhang Hongjia, Ma Jun, Zhu Haiyu, Wang Wensheng. Design of“Solar Blind”Ultraviolet Zoom Optical System Used in Corona Detection[J]. Laser & Optoelectronics Progress, 2014, 51(10): 102201.