Comparison type colorimeter

Details Comparison type colorimeter Comparison type colorimeter

1976-09-07

1978-10-31

Evans, F. L.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

356 93, 356212, 362 32, G01J 350

Patent

active

041231724

ABSTRACT:
A comparison type colorimeter concentrates unknown and reference light beams onto the same surface area portion of a single photosensor and additionally filters the unknown and reference light beams by the same color filters and, preferably, portions thereof. Moreover, an enclosed light source produces light for the colorimeter to eliminate shift in illumination due to dust accumulation on the lamp and/or reflector of the light source.

REFERENCES:
patent: 2892378 (1959-06-01), Canada
patent: 3332313 (1967-07-01), Batson
patent: 3461856 (1969-08-01), Polanyi
patent: 3926501 (1975-12-01), Hama
patent: 3973849 (1976-08-01), Jackson et al.
patent: 3976891 (1976-08-01), Parkinson

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