Continuous measurement of the surface roughness of a cold-rolled

Details Continuous measurement of the surface roughness of a cold-rolled Continuous measurement of the surface roughness of a cold-rolled

1986-12-05

1989-02-07

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356371, 356446, G01H 2186

Patent

active

048033740

ABSTRACT:
A light beam, e.g. from a laser, is transmitted onto the surface of a cold-rolled product such as steel strip. The light beam has a wavelength at least equal to the maximum roughness of the product surface. The reflected light energy is measured, preferably in the specular direction with respect to the incident beam; the surface roughness is deduced from that measurement. The light beam may be interrupted to provide two beams alternately incident on the same spot at different angles.

REFERENCES:
patent: 4498771 (1985-02-01), Makosch et al.
patent: 4629319 (1986-12-01), Clarke et al.
patent: 4650330 (1987-03-01), Fujita
P. Beckmann and A. Spizzichino, "The Scattering of Electromagnetic Waves From Rough Surfaces," Pergamon Press, 1963, pp. 80-95.

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