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用正弦波模板法测定感光胶片的调制传递函数(MTF)时,主要的误差有以下几种:第一是颗粒噪声的影响,第二是手工数据处理产生的误差,第三是扫描时试样上的线条可能和狭缝不完全平行所造成的一定的测量误差。为了尽量减小上述误差,实验中我们使用了一台小型电子计算机。在计算机程序中用了“同相位叠加”技术,扫描时用了一种特殊的“调平行”方法。测定是完全自动的,测定结果的重复性较好,速度也较快。
Sine wave template method to determine the modulation transfer function (MTF) of photosensitive film, the main errors are the following: The first is the impact of particle noise, the second is the error of manual data processing, and the third is the sample The lines may not be exactly parallel with the slit caused by a certain measurement error. In order to minimize the above error, we used a small computer in the experiment. In computer programs, “in-phase overlay” is used, and a special “line-up” method is used for scanning. The determination is completely automatic, the determination of the repeatability of the better, faster speed.