NONDESTRUCTIVE METHOD FOR MEASURING STATES OF SURFACE AND APPARATUS FOR CARRYING OUT SAID METHOD

摘要

A beam of parallel rays which emerges from a perpendicular object-grid is reflected from a mirror surface and transmitted through a centered optical system to a Lummer dividing cube located at the image focal point of said system so as to produce a direct beam which is focused onto a photoelectric cell after passing through an image-grid and a beam which is deflected at right-angles and focused onto a second photoelectric cell. The image-grid is displaced transversely so as to stop light from the object-grid and the mirror surface is replaced by the surface to be studied. The quotient of the indications given by the two balanced photoelectric cells is characteristic of a given state of surface. The indication given by the deflected-beam cell provides the albedo of a given surface state and color.