滤光片式双视场成像光谱仪光学系统设计

为了满足机载搜索与跟踪系统的实际使用要求，根据变焦系统的基本理论和成像光谱系统的特点，设计一个滤光片式双视场成像光谱仪光学系统实例。系统采用1/3英寸CCD接收，像元尺寸为6.0 m6.0 m。通过高斯法分析与求解得到初始结构，使用Zemax软件对其优化，实现0.45 m～0.7 m/0.6 m～0.95 m双波段清晰成像，通过轴向移动变倍组完成139.75/32.25双视场转换，在视场切换过程中，F数为5.6且恒定不变。设计结果表明:在各谱段下系统宽视场畸变3.5%，窄视场畸变0.2%，探测器的Nyquist频率50 lp/mm处光学传递函数的峰值均大于0.5，系统的最小后截距大于35 mm，用以安装滤光片轮，满足装配要求。

Optical design of dual field-of-view imaging spectrometer with filters

In order to meet the practical requirement of airborne searching and tracking systems, a dual field-of-view imaging spectrometer with filters was designed based on the theory of zoom system and imaging spectrometer.The CCD of 1/3 inches was used, and the size of the pixel was 6.0 μm×6.0 μm .The initial structure was obtained by using the Gaussian method, the system was optimized by using Zemax software. Dual waveband (0.45 μm~0.7 μm/0.6 μm~0.95 μm) clear imaging was achieved, axial moving group could complete double field-of-view switch(13°×9.75°/3°×2.25°). In this process, F number was 5.6 and constant. The design results show that the distortion of the wide-FOV is less than 3.5%, the distortion of the narrow-FOV is less than 0.2%, The peak values of MTF are more than 0.5 at Nyquist 50 lp/mm and the minimum back intercept range of the system is greater than 35 mm to install filters, which meets the assembly requirements.