变折射率介质对成像变形的影响  

Impact of Variable-Refractive-Index Medium on Imaging Distortion

作　　者：黄战华[1] 王蓓[1] 陈嘉佳[1] 程红飞[1] 赵海山[2] 张尹馨[1] 

机构地区：[1]光电信息技术科学教育部重点实验室,天津300072 [2]天津大学精密仪器与光电子工程学院,天津300072

出　　处：《天津大学学报》2006年第6期708-711,共4页Journal of Tianjin University(Science and Technology)

基　　金：国家自然科学基金资助项目(60377001).

摘　　要：为了得到由介质折射率不均匀导致的对成像质量的影响规律,选取了4种典型的折射率分布,应用光线追迹算法,得到在视场角、物距和折射率变化幅度共同作用下实际像点与理想像点间偏差的变化曲线．对于轴向折射率分布,其偏差与视场角成线性关系,随折射率变化幅度的增大而增大,但不随物距变化;对于径向折射率分布, 其偏差与视场角一般成非线性关系,并随着视场角的增大而增大,而且随折射率变化幅度的增大而增大,物距变化能够导致偏差的显著变化．In order to find the influence of variable-refractive-index medium on imaging quality, four typical distributions of refractive index are selected, and the algorithm of ray tracing is applied, furthermore, the curves of the error between actual image point and ideal image point are described when the viewing field angle, the object distance or the range of refractive index vary. As for axial refractive index distribution, the error varies directly with viewing field angle and increases with the range of refractive index, but does not vary with object distance. As for radial refractive index distribution, the error generally varies nonlinearly and increases with the viewing field angle and range of refractive index, and changes distinctly with the object distance.

关 键 词：折射率 光线追迹 成像变形 图像复原 

分 类 号：O435.1[机械工程—光学工程]