Optical Tests Using Fibers, Balls, and Ronchi Gratings

Abstract

Optical fibers and ball bearings can be used as test tools. An optical fiber may be easily fashioned into a bright source that causes a minimum of obscuration. Ball bearings may be repolished to nearly perfect spheres and used as autoreflecting optics at nearly suitability sible foci in certain tests. Finally we look at the Ronchi test and discuss its suitability as a test device in many differing situations.