45°视场角投影式头盔在视空间的性能评价  

Optical Assessment of a 45° Field-of-View Lens for Head-mounted Projective Display in Visual Space

作　　者：范海英[1] 王肇圻[1] 赵顺龙[2] 

机构地区：[1]南开大学现代光学研究所光电信息技术科学教育部重点实验室,天津300071 [2]华北电力大学应用物理系,河北保定071003

出　　处：《光子学报》2007年第12期2329-2333,共5页Acta Photonica Sinica

基　　金：国家自然科学基金(60577015)资助

摘　　要：提出理想透镜像距不变,通过改变其焦距来模拟人眼调节完成视空间性能评价的一种新方法.对45°投影式头盔物镜系统进行了精确的视空间评价.其MTF评价结果显示,系统在眼睛注视0°视场时可达到1 arc minute的分辨率;注视+13 .1°视场时可达到1 .4 arc minute的分辨率.眼睛无论是注视0°视场还是+13 .1°视场,只有在一定的视场范围内,调节模糊和像散模糊才不会影响图像的清晰程度,且系统的横向色差和二级光谱均小于人眼的最小分辨角,不会对成像清晰度造成影响.眼睛注视+13 .1°视场时,系统的调节和调节模糊、像散和像散模糊、横向色差和二级光谱均具有明显的非对称性.此外,与改变理想透镜像距进行视空间评价的结果相比较,只有注视13 .1°视场时的MTF差别较大.A new method is presented to simulate the actual accommodation of human eye by changing the focal length instead of the image distance of the perfect lens. A detailed assessment of a 45°Field-of-View Object lens design for Head-mounted projective displays in visual space is presented. The results of assessment of MTF show, when the eyes gaze at the 0°field of view, the lens can provide an 1-arcmin resolution. And turning the eye and focusing on the ＋13. 1°field of view, the lens can provide an 1.4- arcmin resolution. Expecting in some especial field of view, the accommodation and astigmatism do not make loss in resolution whether the eye focusing on 0° or ＋ 13. 1° field of view. The lateral color and secondary color do not make loss in resolution whether the eye focusing on 0° or ＋13.1° field of view. The performance in visual space presents obviously nonrotationally symmetric when the eyes focus on 13. 1°field of view. In addition, compared with the results of optical assessment got by changing the image length, the MTF presents a large difference when focused on the ＋13. 1°field of view, and the differences of other items are very small.

关 键 词：应用光学 投影式头盔系统 视空间评价 光学设计 

分 类 号：O439[机械工程—光学工程] TH74[理学—光学]