摘要
针对三线阵测绘相机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了一种兼具匹兹瓦型与对称型优点的新型光学系统结构。该系统在Nyquist频率77 lp/mm时,正视相机全视场的平均传递函数为0.613,前、后视相机全视场的平均传递函数为0.578;正视相机畸变为2×10-5,前、后视相机畸变为2.4×10-5。运用公差的灵敏度分析和反转灵敏度分析,计算了系统内各公差参数对光学系统成像质量的影响,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,各相机光学系统传递函数的测试值均在0.451以上,满足实验室静态传递函数>0.2,相对畸变<3×10-4的指标要求,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。
According to the configurations of optical system in a three line array mapping camera,a new optical system integrated with excellent features by Petzval and symmtry was designed based on a telecentric path to meet the requirement of stereoscopic mapping.The system shows a good imaging quality,and the MTF value of each lens is close to the diffraction limit at the Nyquist frequency of 77 lp/mm.Furthermore,the distortion of each optical system is less than 2.0×10-5 for the straight-sight camera and 2.4×10-5 for forward-sight and backward-sight cameras.Sensitivity analysis and inverse sensitivity analysis were used to compute the effect of each tolerance parameter on the optical system performance,and the proper tolerance requirements and compensators were determined.On the basis of tolerance given,the optical system with high image quality and low distortion was fabricated and assembled.The tested result shows that the MTF of each optical system can reach 0.451 at the Nyquist frequency of 77 lp/mm,which meets the requirements for static MTF more than 0.2 and relative disortion less than 3×104 and proves that tolerancing analysis methods are correct and feasible.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2011年第7期1444-1450,共7页
Optics and Precision Engineering
基金
国家自然科学基金资助项目(No.60507003)
关键词
三线阵测绘相机
光学设计
公差分析
three line array mapping camera
optical design
tolerance analysis
