Sensor for active thermal detection
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United States of America Patent
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-
Oct 8, 1991
Grant Date -
N/A
app pub date -
Nov 16, 1989
filing date -
Nov 16, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A first heater is attached to a sensor capable of emitting thermal radiation toward an object to be sensed. Electrical energy provided to the heater, required to maintain the sensor at a predetermined temperature when it is radiating energy toward the object is monitored by a circuit which provides a signal that is indicative of the required energy. A second heater provides a baseline temperature for the sensor. For greater accuracy, two sensors are heated by a common baseline heater. One of the sensors is shielded from radiation toward the object and controls the baseline heater, the other sensor emits thermal radiation toward the object and has a heater for maintaining it at a predetermined temperature for providing the signal indicative of the required energy as described above.
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