基于自动对焦技术的透镜曲率半径检测  

Curvature radius testing of optical lens based on autofocusing technology

作　　者：张亦慧[1] 赵志强[1] 

机构地区：[1]深圳职业技术学院计算机与软件工程学院,广东深圳518055

出　　处：《应用光学》2012年第5期931-935,共5页Journal of Applied Optics

摘　　要：为实现光学透镜曲率半径的快速准确测量,设计了一种基于自动对焦技术的非接触式透镜曲率半径测量方案。测量系统分别在被测透镜表面的顶点位置和曲率中心位置自动对焦,系统所记录的两个位置之间的距离即为曲率半径。针对透镜曲率半径检测应用,对自动对焦技术进行了改进:将连通区域提取技术应用于定位目标图像,提高了清晰度评价函数的灵敏度;利用均值比较法和三点法改进了传统爬山搜索策略。实验结果表明:基于自动对焦技术的透镜曲率半径检测是有效的,测量误差低于0.196%,测量重复性好于0.109%。该方法已经成功应用于透镜曲率半径测量仪。An autofocusing-technique-based method for rapid and accurate non-contact measure- ment of radius of curvature （ROC） of optical lens is designed. The autofocusing is performed on the lens vertex and in the center of curvature respectively, and the distance between these two positions is ROC. The autofocusing technology is improved for the application of ROC measurement of optical lens： the connected region extraction is used to label the target image, and the sensitivity of sharpness evaluation function is improved; the searching strategy, i. e. the traditional hill-climbing method, is improved by mean-comparison and 3-point method. The experiments validate the autofocusing-technique-based ROC measurement, and the accuracy is better than 0.2%, the repeatability is better than 0. 109%. This approach has been applied to a optical lens ROC test station successfully.

关 键 词：应用光学 透镜参数检测 曲率半径 自动对焦 清晰度评价函数 

分 类 号：TN206[电子电信—物理电子学] TP391.7[自动化与计算机技术—计算机应用技术]