Independent measurement of dual sided properties of sheet material
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United States of America Patent
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Sep 22, 2009
Grant Date -
Dec 27, 2007
app pub date -
May 24, 2006
filing date -
May 24, 2006
priority date (Note) -
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Abstract
A dual sided sheet surface property sensor has the capability to simultaneously measure both sides of a moving sheet at the same location of the sheet on the top and bottom surfaces of the sheet. The energy directed to each side of the sheet may include UV, visible light, infrared, radio frequency, microwave, broadband, or X-ray. The sensor has a source and associated detector on each side of the moving sheet and each source provides energy at a different modulation frequency and the associated detector is responsive only to that frequency.
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