摘要
提出了一种新型的长波红外鱼眼镜头设计方法,基于高斯光学和三级像差理论,在传统的反远距的广角镜头的基础上,增加一片负弯月型透镜的前组,使其半视场角由原来的±70°增加到±100°。采用等距离投影成像方法,系统f–θ畸变小于6%,焦距为1.97 mm,相对孔径为1∶1,采用像方远心的成像设计,边缘视场相对照度达到80%。为了增大孔径,消除轴外像差,采用五片非球面设计,成像质量接近衍射极限,全视场的调制传递函数大于0.37@42 lp/mm,采用机械被动式的无热化设计方法可以满足较宽的温度范围内系统成像质量稳定。设计结果对长波红外鱼眼光学系统设计具有一定的参考价值。
A novel design method for long-wave infrared(LWIR)fisheye lens was proposed based on Gaussian optics and the third-order aberration theory.The half field of view(FOV)of traditional inversed telephoto wideangle lens increased from±70°to±100°by adding a negative meniscus to pre-group.By using the equidistant projection imaging method,the f-θdistortion of the system was less than 6%.The focal length was 1.97 mm,its relative aperture was 1∶1,the system was telecentric structure in the image space,and its relative illumination of the marginal FOV achieved 0.8.A five-piece aspheric design was adopted to increase the aperture and remove the off-axis aberrations.The imaging quality is near-diffraction-limited.The modulation transfer function value was above 0.37@42 lp/mm.The imaging quality of the system was stable at a wide range of temperatures with the mechanically passive athermal method.The results have a certain reference for LWIR fisheye optical system design.
作者
张继艳
孙丽婷
秦腾
Zhang Jiyan;Sun Liting;Qin Teng(School of Opto-electronic and Communication Engineering,Xiamen University of Technology,Xiamen 361000,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2022年第11期232-239,共8页
Infrared and Laser Engineering
基金
国家自然科学基金(61704142)。
