轴棱锥线聚焦特性对成像系统焦深的影响  

Effect of axicon line focusing characteristics on imaging system′s focal depth

作　　者：陈姿言 胡威旺 吴逢铁[1] 

机构地区：[1]华侨大学信息科学与工程学院福建省光传输与变换重点实验室,福建厦门361021

出　　处：《光电子．激光》2017年第5期560-565,共6页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61178015);福建省科技创新平台计划(2012H2002);泉州市科技重点(2014Z127)资助项目

摘　　要：通过傅里叶光学理论和透镜成像理论对轴棱锥线聚焦与凸透镜点聚焦两种成像系统进行分析,并探讨了它们对成像系统焦深的影响。利用ZEMAX光学设计软件,仿真模拟出系统在不同轴向距离的截面光强分布图。以蓝光LED为光源,对这两种成像系统进行实验验证,拍摄不同轴向距离处的截面光强分布图。结果表明,轴棱锥所具有的线聚焦特性,能将光线连续地会聚到沿轴线不同位置上,图像的清晰度高,且在最大无衍射距离内无需调焦,具有更大的焦深;理论分析、仿真模拟与实验结果相吻合。The axicon line focusing and convex lens imaging systems are analyzed and the effect on their imaging system＇s focal depth is explored via the Fourier optics theory and the lens imaging theory. The optical design software of ZEMAX is used to stimulate the cross-section optical intensity distributions of the system at different axial distances. Taking the blue LED as the light source in the experiment, these two imaging systems are verified and the cross-section optical intensity distributions at different axial distance are photographed. Results show that the line focusing characteristics of axicon can focus light continuously to the points along the axis, and that the resolution of images is higher. It is no need to ad- just focus within the maximum non-distraction distance, and the focal depth is larger. The theretical anal- ysis, numerical simulation and experimental results are consistent.

关 键 词：成像系统 轴棱锥 凸透镜 焦深 无衍射光束 

分 类 号：O435.1[机械工程—光学工程]