Optical monitoring

Details Optical monitoring Optical monitoring

1991-08-07

1993-07-20

Rosenberger, Richard A.

Optics: measuring and testing

By polarized light examination

With light attenuation

356446, G01B 1130

Patent

active

052298353

ABSTRACT:
A hand held instrument for measuring roughness of a surface, such as "orange peel", on a painted surface employs a scanning disc (58) which mounts a unique unfocused light source (60) to project a diverging light beam (12,68) at the surface (14,54) in a circular scan pattern. Light (16) reflected from the surface is received by a sensor (18,80) which produces an output electrical signal (20) having an amplitude and frequency that follow the amplitude and frequency of reflected light received by the sensor. Electrical signals representing amplitude (32) and frequency (36) are suitably combined (38) to provide an output display (40) of magnitude of orange peel. A point light source (106-116) is provided by removing part of the integral lens (108) of a conventional light emitting diode and roughening the surface (112) exposed by removal of the lens to provide a diffusing exit window for the diode. A plate (114) having an aperture (116) smaller than the size of the light emitting chip (96) of the diode is placed on the roughened surface and a lens (130) is employed to control divergence of light from the point source so as to provide an unfocused, slightly diverging light beam (134).

REFERENCES:
patent: 2755702 (1956-07-01), Cook
patent: 4019066 (1977-04-01), Lucas et al.
patent: 4213708 (1980-07-01), Lucas
patent: 4629319 (1986-12-01), Clarke et al.
patent: 4770536 (1988-09-01), Golberstein
patent: 4937764 (1990-06-01), Komatsu et al.
patent: 4966455 (1990-10-01), Avni et al.
patent: 4989984 (1991-02-01), Salinger

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