Method and apparatus for determining the reflective properties o

Details Method and apparatus for determining the reflective properties o Method and apparatus for determining the reflective properties o

1974-08-08

1978-02-07

Corbin, John K.

Optics: measuring and testing

Photometers

356210, 356104, G01N 2148

Patent

active

040724263

ABSTRACT:
A method and apparatus for determining the reflective characteristic of surfaces, especially coated surfaces, in which a beam of parallel light rays are directed against the surface at a predetermined angle of incidence. The light rays reflecting from the surface at an angle numerically equal to the angle of incidence are caused to converge and are supplied to a receiver which may be in the form of a light sensitive resistor. The light which scatters from the surface by reflecting therefrom at angles numerically different from the angle of incidence are, at least in part, collected and caused to converge and are supplied to a second receiver which may also be in the form of a light sensitive resistor. The changes in values of the resistors when illuminated in the aforesaid manner are compared and thereby a comparison is arrived at of how much light is reflected directly from the surface and how much light is scattered during reflecting.

REFERENCES:
patent: 2378433 (1945-06-01), Rezdorfer
patent: 3310680 (1967-03-01), Hasegawa
patent: 3565568 (1971-02-01), Hock
patent: 3571291 (1971-07-01), Greer et al.
patent: 3804521 (1974-04-01), Sprague
patent: 3835315 (1974-09-01), Gravatt
patent: 3850526 (1974-11-01), Corey
Hunter et al., "A Gloss Test for Waxed Paper", TAPPI, vol. 39, No. 12, Dec. 1956, pp. 833-841.
Hunter; Richard S., "Methods of Determining Gloss", Research Paper RP958, Journal of National Bureau of Standards, vol. XVIII, Jan. 1937.

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