用光学传递函数精确测定CCD列阵最佳成像位置
Precision Determination of the Best Imaging Position of CCD Array of Space Camera with Optical Transfer Function
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摘要: 提出一种直接采用CCD作为光电转换元件,以几何尺寸精密的CCD列阵作为狭缝,进行高精度、高密度的自动采样,扫描"刀刃扩展函数"(ESF)。再配用微型计算机技术,以数字付里叶分析方法测量光学传递函数(OTF)。基于CCD测试OTF的实现,可直接精确判定CCD列阵的最佳成像位置。Abstract: A measurement method of optical transfer function(OTF)is discribed in this paper,in which charge-coupled device(CCD)in space camera,with an image sampler joined up with a PC,is used directly as an optoelectronic element.Knife edge scanning with high precision and high sampling density and digital Fourier analysis method is adopted.After measuring the defocal MTF curve of space camer-a,the best imageing position is determined precisely.
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