在用显微镜作为光学触测器具的光学计量仪器中,象工具显微镜、万能测长机以及三座标测量机等,以前经常采用两种工作方法:影象法和轴切法。影象法是一种纯光学的方法,它具有光学触测的特点:非接触、无磨损和无测力等,并且操作简便,因此是目前计量工作中最常采用的方法。但是这种方法受到最佳光阑、显微镜调焦的及生理上的 In optical metrology instruments that use a microscope as an optical touch-detecting instrument, tooling microscopes, universal length measuring machines, and coordinate measuring machines have been used two methods of operation: image method and shaft cutting method. Imaging method is a purely optical method, it has the characteristics of optical touch: non-contact, no wear and no load, etc., and easy to operate, it is the most commonly used method of measurement work. However, this method is best aperture, microscope focusing and physiology