利用柱边衍射成象,可以确定圆柱工件外径的边缘点位置,配上适当的测长装置和微机,即可构成工件外径的在线检测系统。本文介绍了柱边衍射定位的原理,讨论了定位光路中光阑的构成和作用,并描述了柱边衍射定位测径的实验装置。 The use of cylindrical edge diffraction imaging, you can determine the outer diameter of cylindrical workpiece edge point position, coupled with the appropriate length measuring device and microcomputer, you can form the workpiece diameter of the on-line detection system. In this paper, the principle of diffraction at the edge of the column is introduced. The structure and function of the stop in the optical path are discussed. The experimental setup of the diffraction measurement of the edge of the column is also described.