Apparatus for measurement of reflection density

Details Apparatus for measurement of reflection density Apparatus for measurement of reflection density

1989-03-31

1991-08-13

Rosenberger, Richard A.

Optics: measuring and testing

Of light reflection

By comparison

356259, 356446, G01N 2155

Patent

active

050392255

ABSTRACT:
An apparatus for measurement of optical reflection density of a surface of an article, such as a color developed analytical tape for clinical test. The apparatus comprises a support for supporting the article, a source of pulsed light and two light detectors. An optical guide directs the pulsed light to the surface of the article in a direction at an angle other than 90.degree. to the surface of the article. A light-transmissive flat plate is arranged between the optical guide and the surface of the article and may be oriented at an angle from 0.degree. to 90.degree. with the surface of the article to be measured. One of the light-detectors detects a portion of the pulsed light reflected from the surface of the light-transmissive flat plate as reference light, and the second light-detector detects a vertically reflected portion of the pulsed light diffusely reflected on the surface of the article. Light detected from the second detector may be provided for analysis after comparison with respect to the reference light of the first detector.

REFERENCES:
patent: 3822098 (1974-07-01), Rudder et al.
patent: 4029419 (1977-06-01), Schumann, Jr. et al.
patent: 4066403 (1978-01-01), Bruschi
patent: 4260263 (1981-04-01), Kummer
patent: 4365896 (1982-12-01), Mihalow
patent: 4629322 (1986-12-01), Pollard
patent: 4753530 (1988-06-01), Knight et al.

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