Method for detecting a transparent object and a detector device
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United States of America Patent
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Issued Date -
Jan 23, 2003
app pub date -
Jun 26, 2002
filing date -
Jul 23, 2001
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Abandoned
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Abstract
Detecting a transparent object, in particular a web or conveyor belt of a printing press with at least one radiation source and at least one receiver arrangement for receiving rays from the radiation source, whereby the light intensity change based on the transparent object is independent of the position of the major optical axis h of the transparent object. A particular embodiment envisages two .lambda./4 small plates, which are each attached to one of two linear polarization filters, which intersect one another.
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