Sheet material sensor compensation
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United States of America Patent
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Mar 24, 1992
Grant Date -
N/A
app pub date -
Feb 15, 1991
filing date -
Feb 15, 1991
priority date (Note) -
Expired
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Abstract
A device for measuring the gap between the radiation source and the radiation sensor of a basis weight gauge. A caliper sensor measures the thickness of a sheet of material as it passes through the gap, while the caliper contact shoe rides on the sheet and urges it against a first side of the gap. A linear variable differential transformer measures the distance between a reference point on the contact shoe and the opposed side of the gap. The gap dimension is the sum of the sheet thickness, the distance between the caliper reference point and the second side of the gap, and a readily measurable constant.
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