Color grading apparatus

Details Color grading apparatus Color grading apparatus

1974-12-09

1976-12-21

Webster, Robert J.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

250226, 2091116, G01M 2122, B07C 510

Patent

active

039985555

ABSTRACT:
Apparatus for color grading of liquid or solid products, such as fruits, vegetables, etc., said apparatus employs an electronic device which measures the ratio of reflectance of the products at two separated parts of the light spectrum. The device views either a calibration surface or the product being tested so that between tests the operator can see whether or not the instrument is holding its calibration and adjust it if necessary.

REFERENCES:
patent: 2938424 (1960-05-01), Herriott
patent: 3016788 (1962-01-01), Smith
patent: 3867039 (1975-02-01), Nelson
Ward, American Dyestuff Reporter, vol. 55, No. 23, pp. 55-61.
Olsen, Control Engineering, Nov. 1965, pp. 90-93.

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