Method and apparatus for measuring the opacity of sheet material

Details Method and apparatus for measuring the opacity of sheet material Method and apparatus for measuring the opacity of sheet material

1980-12-29

1983-04-19

Arnold, Bruce Y.

Optics: measuring and testing

For light transmission or absorption

G01N 2101

Patent

active

043803962

ABSTRACT:
To measure the opacity of sheet material, such as paper, a beam of light is directed against the material and the intensity of any light passing through the material is sensed and converted to a visual readout. A plurality of opacity measurements are made at different areas on the sheet material and, when a selected number of measurements have been made, a readout of the average value of the measurements is generated. The particular technique enables a large number of opacity measurements to be quickly and conveniently made and averaged, and is considerably less complicated and time consuming than opacity measurements which are conventionally made as a function of contrast ratios.

REFERENCES:
patent: 2206214 (1940-07-01), Wicker
patent: 4224513 (1980-09-01), Casey et al.
patent: 4229107 (1981-10-01), Childers
Hufner, "Semi-Automatic Interpretation of Spectral Plates Using the MD100 Microdensitometer and the KSR 4100 Minicomputer", Jena. Rev., (Germany), vol. 22, 1977, pp. 220-223.
Bothe, K., et al., "Microprocessor-Controlled Photometric Evaluation of High Speed Cinematographic Films", J. Physics, Sci. Instrom., vol. 12, (1979), pp. 201-204.
Revesz et al., "A Laser Scanner for the Densitometric Analysis of Radiographs", Med. Phys. 6(3), May/Jun., 1979, pp. 216-218.

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