Method and apparatus for ply discontinuity detection
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United States of America Patent
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Apr 7, 1998
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N/A
app pub date -
Aug 28, 1996
filing date -
Aug 28, 1996
priority date (Note) -
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Abstract
A ply break detector for a laminate web uses a short time constant low pass filter and a long time constant low pass filter for filtering output signals from a sonic web scanner. A difference circuit compares output signals from the two filters to create a difference signal. A ply discontinuity indication is generated when the difference signal exceeds a predetermined threshhold with a predetermined persistence. Analog and digital versions are disclosed.
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