Optics: measuring and testing – By polarized light examination – With light attenuation
356378, 356387, G01B 1100, G01B 1108
A method and apparatus are provided for measuring the magnitude of spherical hardness testing indentations in solid surfaces by scanning the indentations with a light beam. Scanning is achieved by tilting the beam in one or several planes perpendicular to the testpiece surface through a point which is the center of rotation for the beam tilting as well as the center of curvature of the indentation area in the plane of tilting. At least the part of the indenter making contact with the indented surface is spherically shaped, and the scanning light spot follows an arcuate path in the indentation being measured. The scanning light beam is sent through a transparent indenter, or scanning is carried out directly on the indentation after removal of the indenter. The intensity of the light reflected from the indentation in the direction of incidence is continuously measured, and the angle between the two principle intensity variations on each scan serves for determining the magnitude of the indentation and thus the Brinell hardness of the tested surface.
patent: 2216943 (1940-10-01), Hanemann
patent: 3754436 (1973-08-01), Saxton
patent: 3822946 (1974-07-01), Rynkowske
Rainiger, S., "Eine Anordnung zur Photometrischen Messung von Vickers-Harteeindrucken", Messtechnik, 12-1973, pp. 379-384.
McGraw Vincent P.
Punter Wm. H.
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