Method and apparatus for measuring orange peel and texture in pa

Details Method and apparatus for measuring orange peel and texture in pa Method and apparatus for measuring orange peel and texture in pa

1991-07-22

1992-10-06

Fields, Carolyn E.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356237, 356445, G01N 2188, G01B 1130

Patent

active

051534452

ABSTRACT:
Orange peel or texture of a painted surface is measured by scanning a light beam across the surface and receiving the reflected beam on an area detector generating a signal having a first component varying with surface slope variations in the painted surface and a second component due to scan rate. Apparatus is provided for orienting the light beam relative to the painted surface so as to be reflected therefrom to the detector area without re-reflection from the painted surface; and a converging lens converges the light beam on the area detector. A portable, surface contacting embodiment uses a plurality of projecting feet for orientation to the painted surface and relies on the converging lens for convergence. In a non-contact embodiment, variations in orientation and curvature of the surface are detected by the second component of the signal and compensated for in closed loop control of a mirror and the converging lens to dynamically converge the beam on the area detector.

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