Fare card explosive detection system and process
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United States of America Patent
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-
Oct 3, 2006
Issued Date -
N/A
app pub date -
Jul 8, 2005
filing date -
Jul 8, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A substrate card, in the form of a Metrocard.RTM., farecard, keycard, passport, boarding pass or the like, presented for controlled gateway passage at an automatic reader, is photographed and the captured card image is digitized. The card then is heated to a point where trace explosive present on the card is subjected to an energetic reaction imparting a char smudge signature. The card is cooled and a second image is captured and digitized. The digitized images are subjected to a subtractor stage resulting in an isolated char smudge signature image possibly in the form of at least a partial fingerprint residue recognizable by a computer. Upon char image detection, which may include a fingerprint matching process, the computer directs the controlled gateway to restrain the card presenter and secure the card as evidence. The card may be pre-coated to avoid ignition and to enhance trace material adhesion.
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