Absorption gauge for determining the thickness, moisture content or other parameter of a film of coating
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United States of America Patent
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May 10, 1988
Grant Date -
N/A
app pub date -
Oct 1, 1986
filing date -
Nov 19, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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