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光学元件、结构件的加工和光机系统的装校会导致光学系统的入瞳孔径尺寸和焦距偏离设计值,从而导致光学系统F数的改变,并且光学系统在光谱谱段内成像,光学系统的空间截止频率也在改变。分析了入瞳孔径尺寸D(100～1000mm)、焦距f′(400～2000mm)、F数(4～20)、光谱波长λ(350～800nm)的变化对光学系统MTF的影响。结果表明:增大入瞳孔径尺寸D、空间截止频率foc,有利于提高光学系统的MTF;增大焦距f′、F数、波长λ和规化频率μ,会降低光学系统的MTF。MTF对λ的敏感度是MTF对F的敏感度的F/λ倍,MTF对D的敏感度是MTF对f′的敏感度大小的F倍,且方向相反。对于成像光谱谱段较宽的光学系统,应注意波长λ对MTF的影响。
Processing of optical components, structures and mounting of the optomechanical system can result in deviations in the pupil size and focal length of the optical system from design values, resulting in changes in the F-number of the optical system and imaging of the optical system in the spectral band, The cutoff frequency of space is also changing. The influence of the variation of the entrance pupil size D (100-1000 mm), focal length f ’(400-2000 mm), F number (4-20) and spectral wavelength λ (350-800 nm) on the optical system MTF was analyzed. The results show that increasing the pupil size D and the spatial cut-off frequency foc can improve the MTF of the optical system. Increasing the focal length f ’, the F number, the wavelength λ and the normalized frequency μ will reduce the MTF of the optical system. The sensitivity of MTF to λ is F / λ times the sensitivity of MTF to F. The sensitivity of MTF to D is F times the sensitivity of MTF to f ’, and the opposite direction. For a wide range of imaging spectral optical system, should pay attention to the wavelength λ on the impact of MTF.