面阵CCD调制传递函数测试仪器研究:面阵CCD调制传递函数测试仪器研究
Study on modulation transfer function measurement instrument with matrix for matrix CCD
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作 者:何煦 姬琪
He Xu, Ji Qi (Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China)
机构地区:中国科学院长春光学精密机械与物理研究所,长春130033
出 处:《电子测量与仪器学报》 CSCD 2014年第28卷第10期 1100-1108页,共9页
Journal of Electronic Measurement and Instrument
基 金:国家自然科学基金(61307114)项目
摘 要:电耦合器件(charge coupled device, CCD)的成像质量直接影响新一代星敏感器的综合性能,现有CCD测试仪器受初位相对准偏差影响,重复精度较低。论文推导了基于条纹对比度原理的面阵CCD调制传递函数( modulation transfer func-tion, MTF)表达式,分析初始位置偏差与MTF重复精度间的数学关系,提出初位置平均调制传递函数的概念与数据处理方法,据此改进条纹板设计,并对CCD测试仪器光学、机械、电控系统进行仿真设计。采用两片Kodak KIA-4021面阵CCD作为试样,在感光面不同区域对MTF进行多次重复测量,测试重复精度优于0.025。实验结果表明,采用统计平均方法评价CCD成像质量,在感光面不同区域的测量结果一致性较好,重复精度优于极值算法。
The imaging quality of Charge Coupled Device (CCD) affects the comprehensive imaging performance of a new generation star tracker decisively.The existing measurement instrument has lower repeatability which is limited by deviation of initial position.The mathematical model of MTF based on the stripe-contrast method is deduced in this paper.And the function law between the repeatability precision of MTF measurement and the initial position is analyzed.Based on that, the design scheme of the instrument, the implementation methods of the optical, mechani-cal, electrical control and data processing system are proposed.Kodak array CCD modeled KIA-4021 is used as the prototype to measurement the 30 times of MTF in verification tests , and the repeatability precision of the measurement instrument is better than 0.025.The test data indicate that the MTF measurement at the different region shows better consistently than that of using statistic evaluation method .
关键词:光电测量 面阵CCD 调制传递函数 条纹对比度
electro-optical measurement ; array CCD ; modulation transfer function ; stripe-contrast method ;