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本文描述一种以计算机技术为基础,以数字付里埃分析为原理的新型光学传递函数(OTF)测试仪。该仪器以星孔为目标物,经由计算机控制一“刀口”切割由被测物镜所形成的星点像而获得刃边扩散函数(ESF),通过计算机对ESF 进行数值微分得到一维空间分布的线扩散函数(LSF),对LSF 进行离散付里埃变换而获得表征被测物镜成像质量的调制传递函数(MTF)和位相传递函数(PTF)。实测表明,该仪器在0～300线对/mm 范围内具有<±0.02MTF单位的测试精度和<±0.01MTF 单位的重复性。
This article describes a novel optical transfer function (OTF) tester based on computer technology and based on digital Fourier analysis. The instrument takes the star hole as the target and obtains a blade edge diffusion function (ESF) by cutting a star point image formed by the objective lens under the control of an “edge” of a computer. The ESF is differentiated by a computer to obtain a one-dimensional spatial distribution The line spread function (LSF) is used to perform discrete Fourier transform of the LSF to obtain a modulation transfer function (MTF) and a phase transfer function (PTF) that characterize the imaging quality of the objective under test. The measurement shows that the instrument has the test accuracy of <± 0.02 MTF and the repeatability of <± 0.01 MTF in the range of 0-300 lines / mm.