Detection of blemishes in surfaces

Details Detection of blemishes in surfaces Detection of blemishes in surfaces

1973-09-07

1976-01-06

Stolwein, Walter

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250216, 356200, G01N 2132

Patent

active

039315258

ABSTRACT:
A detector of blemishes in a surface comprises a transmitting station from which a beam of light is caused to scan a moving surface to produce a raster pattern thereon. Light specularly reflected from, or transmitted by, the surface is collected at a receiving station after being diffused by a sheet of translucent material disposed in the path of this light. The diffused light in the receiving station is collected and directed by reflective surfaces towards a photodetector such that when the beam engages a blemish in the surface, the amount of light detected falls. The detector combines the sensitivity of collecting large amounts of specularly reflected light with a simple optical system associated with the collecting of diffused light.

REFERENCES:
patent: 2806401 (1957-09-01), Demuth et al.
patent: 3061731 (1962-10-01), Thier et al.
patent: 3396281 (1968-08-01), Blackman
patent: 3549264 (1970-12-01), Christie
patent: 3572947 (1971-03-01), Sepall
patent: 3675016 (1972-07-01), Blaisdell et al.
patent: 3723747 (1973-03-01), Steele

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