提出了一种基于液晶可调谐滤光片(LCTF)多光谱CCD相机光学系统设计方案。该光学系统焦距60 mm, F数为3.5,谱段 范围400～720 nm,视场角16.6°。采用前置扩束光学系统获得满足液晶可调谐滤光片孔径、视场角要求 的光束,后继成像系统采用双高斯型结构。像质分析表明,此设计能够满足使用要求,在谱段范围内, 16个波段都能清 晰成像,满足实际工程需要。

Optical system design of multispectral camera based on liquid crystal tunable filter(LCTF) was presented. The optical system has a focal length of 60 mm, F number is 3.5, spectrum band is 400～720 nm, and the field angle is 16.6°. It consisted of the fore-optical system and the subsequent imaging system, the fore-optical system was adopted in order to attain beam of light which can fulfill requirement of the aperture and field angle of LCTF, the double Gaussian structure was adopted in the subsequent imaging system. The imaging analysis results show that the design fulfills operating and engineering requirement. The optical system can produce a clear image in 16 waveband of the spectral range.