| 基于离焦深度法的自动对焦光路设计 |
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| 引用本文： | 王岩,胡超,陈平,杨嘉文,刘伟伟,林列. 基于离焦深度法的自动对焦光路设计[J]. 光电子．激光, 2019, 30(1): 29-35 |
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| 作者姓名： | 王岩 胡超 陈平 杨嘉文 刘伟伟 林列 |
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| 作者单位： | 南开大学 电子信息与光学工程学院,现代光学研究所,天津 300350,南开大学 电子信息与光学工程学院,现代光学研究所,天津 300350,南开大学 电子信息与光学工程学院,现代光学研究所,天津 300350,南开大学 电子信息与光学工程学院,现代光学研究所,天津 300350,南开大学 电子信息与光学工程学院,现代光学研究所,天津 300350,南开大学 电子信息与光学工程学院,现代光学研究所,天津 300350 |
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| 基金项目： | 天津市科技支撑重点项目(15ZCZDGX00250,8ZCKFGX09400)和发光学及应用国家重点实验室开放基金资助项目 (南开大学 电子信息与光学工程学院,现代光学研究所,天津 300350) |
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| 摘 要： | 基于离焦深度法设计了自动对焦光路,光路由激光 光源,准直扩束透镜,调焦透镜,摄 像头组成。使用ZEMAX软件模拟了对焦过程,通过控制调焦透镜的位置获取光斑半径,计算 对焦位置。 移动调焦透镜,分别在距离对焦目标5.62 cm,7.38 cm,14.02 cm,16.88 cm,20.94 cm处得到了弥散光斑 的直径。计算得到的误差在1mm以内。基于此,实际搭建了对焦光路并进行模拟。采用位移 滑轨模拟透 镜的变焦运动,由摄像头获取物面上的激光斑点,通过MATLAB编程来快速获得光斑直径的之 间的比例。 结果显示,对焦结果误差在1cm以内,考虑到导轨读数存在误差,摄像头像素有限,激光功 率不稳定等原 因,虽然实际结果与理论模拟之间存在差异,但证实了此方法的可行性。后续工作将用位移 平台替换手动 滑轨,编程精密控制透镜的移动位置,实现自动对焦。研究工作为改进本课题组已经开发的 便携式高灵敏 毒品荧光检测系统提供技术参考。
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| 关 键 词： | 离焦深度法 自动对焦 模拟 设计 |
| 收稿时间： | 2018-05-13 |
The design of auto focusing optical path based on the method of depth from defoc us |
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| WANG Yan,HU Chao,CHEN Ping,YANG Jia-wen,LIU Wei-wei and LIN Lie. The design of auto focusing optical path based on the method of depth from defoc us[J]. Journal of Optoelectronics·laser, 2019, 30(1): 29-35 |
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| Authors: | WANG Yan HU Chao CHEN Ping YANG Jia-wen LIU Wei-wei LIN Lie |
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| Affiliation: | Institute of Modern Optics,College of Electronic Information an Optical Enginee ring,Nankai University,Tianjin 300350,China,Institute of Modern Optics,College of Electronic Information an Optical Enginee ring,Nankai University,Tianjin 300350,China,Institute of Modern Optics,College of Electronic Information an Optical Enginee ring,Nankai University,Tianjin 300350,China,Institute of Modern Optics,College of Electronic Information an Optical Enginee ring,Nankai University,Tianjin 300350,China,Institute of Modern Optics,College of Electronic Information an Optical Enginee ring,Nankai University,Tianjin 300350,China and Institute of Modern Optics,College of Electronic Information an Optical Enginee ring,Nankai University,Tianjin 300350,China |
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| Abstract: | In this paper,based on the depth from defocus method,we design an automatic focusing optical path,incl uding laser,collimation lens,focusing lens and CCD camera.ZEMAX software is utilized to simulate the optical path of the focusing process,through which the error is estimated within 1mm,when the di stances of focus target are 5.62cm,7.38cm,14.02cm,16.88cm and 20.94cm.In this basis,the focal optical path is constructed and simulated.Meanwhile the diameters of the light spots are measu red through a camera and analyzed by MATLAB software,which shows an error within 1cm.Both simulati on and experimental results demonstrate the feasibility of the depth from defocus approach to fulfill the a uto-focusing process,in consideration of the error of the guide reading,the limited camera pixel and th e unstable laser power. The subsequent work will replace the manual slide rail with the displacement pla tform,and the program will control the moving position of the lens and realize automatic focusing.The research work provides a technical reference for improving the portable and high sensitive narcotics fluo rescence detection system. |
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| Keywords: | the method of depth from defocus auto-focusing simulation design |
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