(英)短波红外成像变焦匀化激光照明系统
投稿时间:2017-10-27  修订日期:2018-01-04  点此下载全文
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作者单位E-mail
陈大明 山东大学 光学高等研究中心山东大学 信息科学与工程学院 13658643322@163.com 
李永富 山东大学 光学高等研究中心信息功能材料国家重点实验室(中国科学院上海微系统与信息技术研究所) yfli@sdu.edu.cn 
王玉荣 山东大学信息科学与工程学院  
中文摘要:针对近年来得到迅速发展的短波红外成像系统,首先分析了增加激光主动照明的必要性。目前常用的激光照明匀化方案均匀性均不高,达不到照明成像的要求。本文提出了连续变焦激光照明系统,使用成像镜头把光纤端面的像直接成像在被照明表面,照明光斑均匀。分析了变焦照明系统的设计理论,设计了25倍变焦的短波红外激光照明系统。本照明系统的光学镜头由3组镜片组成,由凸轮结构实现连续变焦。体积小,结构简单,变焦倍数大。最终实现了2-50度的照明角度连续变化。照明光斑均匀度达到92.7%。进行了野外成像实验,对人员识别距离可达1.2km。设计的连续变焦激光照明系统对提高短波红外成像系统的夜视能力具有较高的意义。
中文关键词:短波红外成像  激光照明 激光匀化  变焦系统
 
The Zooming and Homogenizing Laser Illumination System for Shortwave Infrared imaging
Abstract:Recent years, shortwave infrared (SWIR) imaging system has been developed rapidly, and additional active lighting is very necessary in some scenarios. At present the uniformities of laser illumination homogenization schemes commonly used are not high, and could not reach the requirements of imaging. A new 25× zoom laser illumination system was designed based on the analysis of the laser model in fiber and the theory of zoom illumination system. The optical lens of the illumination system is composed of three groups of lenses, and realize continuous zoom by using CAM structure. This system is small in size, has simple structure, and gain large zoom ratio. Finally continuous changes in illumination angle achieve 2-50 degrees. Laser illumination intensity uniformity reaches 92.7%. In the imaging experiments, the human identify distance was up to 1.2km.The continuous zoom laser illumination system is of high significant for improving the ability of the short-wave infrared night vision system.
keywords:shortwave infrared imaging  laser illumination  laser uniformity  zoom lens
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