Method and apparatus for detecting the presence of an object
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United States of America Patent
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May 7, 2002
Grant Date -
N/A
app pub date -
Nov 25, 1998
filing date -
Nov 25, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for detecting and classifying an object, including a human intruder. The apparatus includes one or more passive thermal radiation sensors that generate a plurality of signals responsive to thermal radiation. A calculation circuit compares the plurality of signals to a threshold condition and outputs an alarm signal when the threshold condition is met, indicating the presence of the object. The method includes detecting thermal radiation from an object at a first and second wavelength and generating a first and second responsive signal. The signals are compared to a threshold condition that indicates whether the object is an intruder.
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