Method of and apparatus for comparing surface reflectivity

Details Method of and apparatus for comparing surface reflectivity Method of and apparatus for comparing surface reflectivity

1979-09-26

1981-08-18

McGraw, Vincent P.

Optics: measuring and testing

By monitoring of webs or thread

250559, 356430, 356445, G01N 2186

Patent

active

042843561

ABSTRACT:
Light beams directed toward each surface of a sheet are reflected therefrom as first reflected light beams and second reflected light beams. The intensity and/or density of the reflected light beams are acted on to compare the reflectivity of the sheet surfaces, e.g. to determine which surface of the sheet has a more reflective surface.

REFERENCES:
patent: T932008 (1975-03-01), Davis et al.
patent: 2251613 (1941-08-01), Kott
patent: 2963938 (1960-12-01), Irland et al.
patent: 3023900 (1962-03-01), Thier
patent: 3572951 (1971-03-01), Rothwarf et al.
patent: 3666360 (1972-05-01), Mills et al.
patent: 3792930 (1974-02-01), Obenreder
patent: 4035085 (1977-07-01), Seiner
patent: 4072426 (1978-02-01), Horn

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