一、概述基于几何光学原理进行的平面光学零件最小焦距测量中,或物镜焦距配对测量中,提高测量精度的关键在于提高确定焦面位置的精度。现在常用的几种定焦方法中,如使被观察的象与目镜(或显微镜)中的分划板同时看清楚的所谓清晰度定焦法,使被观察的象与目镜中 First, an overview Based on the principle of geometric optics, the minimum focal length measurement of planar optical components, or the objective focal length matching measurement, the key to improve the measurement accuracy is to improve the accuracy of determining the focal plane position. Among several commonly used methods of defocusing, the so-called sharpness definition method that allows the observed image to be clearly seen at the same time as the reticle in the eyepiece (or microscope)