光学系统公差的合理制定是影响相机总体性能的主要因素。首先针对光学系统设计的指标要求,综合考虑空间环境适应性、结构布局等因素,采用像方远心光路,设计离轴三反多光谱相机光学系统;运用公差的灵敏度分析和反转灵敏度分析,计算系统内各公差参数对相机各谱段成像质量的影响,给出合理的公差要求及合适的补偿调整参数。按给定的公差要求,加工、装调了具有较高成像质量的光学系统。实验检测结果表明,相机静态传递函数在全视场所有谱段的实测值均在0.243以上,满足指标要求,制定的公差合理、可行,验证了公差分析与研究方法的正确性。

There is a vast range of prospects on remote sensing, land mapping, resources survey, natural disaster monitoring by using three line array stereoscopic mapping camera. It is useful for improving national economic development and realizing numerical earth. Optical tolerance is a critical step in the optical design process. Sensitivity analysis and inverse sensitivity analysis are used to compute the effect, which reduces the optical system performance by the each tolerance parameter. Suitable tolerating requirements and compensators may be defined to model allowable adjustments made to the lens after fabrication. The optical system with high image quality and low distortion is produced according to the tolerance requirements. The tested result shows the MTF of multi-spectral can reach 0.243 at Nyquist frequency, the tolerance analysis methods are correct and feasible.