Absorption gauge for determining the thickness, moisture content

Details Absorption gauge for determining the thickness, moisture content Absorption gauge for determining the thickness, moisture content

1986-10-01

1988-05-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250560, 250226, G01N 2186, G01V 904

Patent

active

047437758

ABSTRACT:
The apparatus includes means for directing a plurality of beams of radiation of different spectral compositions to a sample such as a film or coating. A part of the beams is transmitted through the sample and received by a radiation detector. Another part of the beams reflected by the sample is in turn reflected, preferably by a concave mirror, back through the sample onto another radiation detector. The signals `a` and `b` from the detectors are combined in accordance with the relationship a/(1-b/a) to suppress optical interference effects.

REFERENCES:
patent: 3210546 (1965-10-01), Perron
patent: 3807873 (1974-04-01), Nakamori
patent: 3827808 (1974-08-01), Cho
patent: 3907440 (1975-09-01), Eichenberger et al.
patent: 4320967 (1982-03-01), Edgar

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