宽视场高分辨率闭路监控系统监控镜头设计

为了满足新形势下闭路监控系统（CCTV）对拍摄视场和高清分辨率的要求，设计了一款复杂化的反摄远型全球面结构的CCTV镜头。该镜头的全视场为80，F#为3，焦距为5 mm，光谱范围为486 nm~656 nm。采用像元尺寸为7.5 m7.5 m，1.27 cm(1/2英寸)的CCD成像。该镜头在奈奎斯特频率67 lp/mm处，全视场MTF接近0.65；在1/2奈奎斯特频率处调制传递函数（MTF）大于0.85；在220 lp/mm处，全视场MTF大于0.3，已经接近衍射极限。镜头像面波前PV值为0.077 9，RMS为0.015 9，达到了瑞利判据的要求。设计评价结果表明，该镜头像差校正满足CCTV监控镜头的成像质量要求。

Design of CCTV lens with wide FOV and high resolution

A close circuit television(CCTV) lens was designed with a complicated reverse telephoto configuration to meet the requirements of wide field of view (FOV)and high resolution which was applied to monitor system. The FOV of the designed lens is 80,the F number is 3,the focal length is 5 mm,and the spectral range is from 486 nm to 656 nm.A 1/2 inch (1.27 cm) CCD was adopted with 7.5 m7.5 m pixel size. The modulation transfer function(MTF) of full FOV is more than 0.65 at 67 lp/mm Nyquist frequency and more than 0.85 at 1/2 Nyquist frequency, and the MTF value of FOV is more than 0.3 at 220 lp/mm, approaching to the diffraction limit. The wavefront map shows that the peak valley (PV) value is 0.077 9 and root mean suare (RMS) value is 0.015 9, which can meet the Rayleigh criterion. The evaluation of optical system shows that the lens has low aberration and high image quality, satisfying the requirement of CCTV monitor system with wide FOV and high resolution.