Thickness sensor suitable for detecting a presence of a plurality of items, such as currency
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United States of America Patent
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Apr 9, 2002
Grant Date -
N/A
app pub date -
Mar 24, 2000
filing date -
Mar 30, 1999
priority date (Note) -
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Abstract
A method and system for detecting a presence of more than one item at a point along a conveyance path, comprising steps of (A) generating a light beam and directing the beam through the path such that a presence of the item will cause the beam to be attenuated; (B) detecting the beam after it is attenuated by the presence of the item; and (C) determining from the amount of attenuation how many items are simultaneously present. In the preferred embodiment the item is an item of currency, and the step of generating a light beam includes a step of operating an optical source, such as an LED or a laser, to generate a beam having a wavelength in the range of about 400 nm to about 1 micrometer or longer.
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