Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1987-10-13
1989-05-23
Evans, F. L.
Optics: measuring and testing
By polarized light examination
With light attenuation
250228, 356236, 356380, G01B 1128
Patent
active
048324957
ABSTRACT:
An apparatus for measuring the relative coverage of a predetermined portion of a sheet of translucent material with an opaque medium such as ink or photographic emulsion, comprising: a light source for providing a relatively constant intensity source of light over a predetermined measuring area; a positioning device for positioning the predetermined portion of the sheet of material to be measured over the predetermined measuring area of the light source; a light measuring device for measuring the relative amount of light from the light source which is transmitted through the predetermined portion of the sheet of material to be measured, whereby the relative amount of opaque medium coverage of the portion of the sheet to be measured is readily determinable by comparison of the measured amount of light transmitted through the predetermined portion of the sheet to be measured with predetermined calibration values.
REFERENCES:
patent: 3099749 (1963-07-01), Williams
patent: 3968363 (1976-07-01), Mielenz et al.
patent: 4461568 (1984-07-01), Welbourn et al.
National Bureau of Standards Scientific Paper No. 447, Aug. 28, 1922, (vol. 18, 1922-1923), entitled "Theory, Construction, and Use of the Photometric Integrating Sphere," by E. B. Rosa & A. H. Taylor.
Seemuller et al, IEEE Transaction on Instrumentation and Measurement, vol. 1M-21, No. 2, May 1972.
Briggs Daniel D.
Vischer Peter
Adolph Coors Company
Evans F. L.
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