Device for calibrating an apparatus for measuring the formation index of a sheet of paper
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United States of America Patent
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Jun 5, 1990
Grant Date -
N/A
app pub date -
May 20, 1988
filing date -
May 27, 1987
priority date (Note) -
Expired
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Abstract
A device for calibrating an apparatus for measuring the formation index of a sheet of paper in which an emitted light beam is directed through the sheet of paper and detected and electronically processed into a modulated output signal. The device has a frosted glass for diffusing the measuring beam of light and an opaque rod mounted for rotation in and out of the beam of light so as to provide a modulation of the detected light of a known amount which can then be used to calibrate the measuring apparatus by adjusting the various parameters of the apparatus to yield the desired known output modulation.
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