激光接收与彩色电视共窗口设计

介绍了激光接收和彩色电视共窗口的多波段光谱融合技术.采用一个焦距为20~450 mm的连续变焦距镜头(视场角在13.68°×10.26°~0.61°×0.46°内连续变化),在会聚光或平行光的条件下,采用立方棱镜或平板玻璃分光,分别进行了对比试验.结果显示,使用会聚光下的立方棱镜分光,在大视场13.68°×10.26°的情况下,光线入射角最大,色偏移严重,图像颜色严重失真.随着视场角的减小,光线入射角减小,图像颜色失真程度逐渐减小,越接近小视场0.61°×0.46°,图像颜色失真现象基本消失;而使用平板玻璃对平行光分光的条件下分光,连续变焦距镜头在整个视场范围内,不仅光学像差满足要求,同时解决了棱镜分光的色偏移问题,图像颜色正常,在空间尺寸苛刻的情况下,彩色电视光学系统MTF在108 lp/mm时达到了0.3,设计结果满足工程应用要求.

Optical design of laser receiving and color TV confocal-window

This paper introduces the multi-band spectral fusion technology of laser receiving and color TV eonfocal-window. A continuous zoom lens with focal length of 20 -450 mm and angel of vision from 13.68°× 10. 26° -0. 61° ×0. 46° is adopted. Under the condition of concentrated or parallel light, the contrast tests are implemented respectively using cubic prism or fiat glass to separate light. Results show that when using cu- bic prism under concentrated light in the big angel of vision of 13.68° × 10.26°, with the biggest light inci- dent angle, serious color deviation and image color distortion occur. With the decrease of angel of vision and light incident angle, the degree of image color distortion declines, and almost disappears when getting closed to the small angel of view of 0.61° × 0.46° gradually. However, under the condition of using fiat glass and parallel light to separate light, continuous zoom lens can not only meet the requirement of optical aberration in the whole range field of view, but also solve the color deviation problem occurred in cubic prism, which shows a regular image color. Under the restrict limitation of room size, the MTF of color TV optical system reaches 0. 3 at 108 lp/mm and the design result meets the requirement of engineering application.