Balanced digital infrared detector circuit
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United States of America Patent
Stats
-
Jul 10, 1990
Grant Date -
N/A
app pub date -
Aug 31, 1989
filing date -
Aug 31, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A digital control circuit uses a single infrared detector to control the clock pulse on a digital counter so that the sensitivity control is based on the length of time a change in infrared radiation persists. A pyroelective detector is located in a voltage divider and the intermediate voltage of the divider is digitally compared to the intermediate voltage in a fixed divider as a digitaly controlled pulse is applied to both dividers. Either an increase or a decrease of infrared radiation causes the digital circuit to permit the counter to be activated.
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