光电工程, 2016, 43 (5): 65, 网络出版: 2016-06-06
智能交通监控系统的光学成像镜头设计
Design of Optical Imaging Lens for Intelligent Transportation Monitoring System
摘要
本文通过 Zemax软件设计一款用于智能交通监控系统车牌识别的宽波段、大孔径、大靶面光学成像镜头。利用红外技术, 保证在昏暗或夜间环境中仍然能够清晰成像。近红外中心波长为 850 nm, 采用 Zemax多重组态设计, 使可见光和近红外光共焦。根据消色差理论, 选择合适材料组合消色差, 最大焦面漂移量为 44 μm。通过镜头应用参数分析, 镜头 F数设定为 1.2, 半视场角为 13°, 使用索尼 ICX814一英寸 CCD图像传感器, 像元尺寸为 3.7 μm×3.7 μm, 全视场 MTF值在空间频率 135 lp/mm大于 0.3。
Abstract
A wide waveband, large aperture and target optical imaging lens is designed by using Zemax software, which is applied to recognize license plate in intelligent transportation monitoring system. By using the infrared corresponding technology, the lens can still obtain clear imaging in the dark or night. The near infrared central wavelength is 850 nm. The Zemax multi-configuration design method is used to make visible light and near-infrared light confocal. According to the achromatic theory, appropriate material is chosen to eliminate chromatism and the maximum focal shift is 44 μm. After analyzing the lens application parameters, the F number is set to 1.2 and half field of view is 13°. In addition, the lens goes with Sony ICX841 CCD image sensor and the target surface is one inch. And the pixels size is 3.7 μm×3.7 μm. Furthermore, MTF of all fields are more than 0.3 at the spatial frequency of 135 lp/mm.
王琨, 林峰. 智能交通监控系统的光学成像镜头设计[J]. 光电工程, 2016, 43(5): 65. WANG Kun, LIN Feng. Design of Optical Imaging Lens for Intelligent Transportation Monitoring System[J]. Opto-Electronic Engineering, 2016, 43(5): 65.