Capacitive occupancy detector apparatus
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United States of America Patent
Stats
-
Jan 3, 1989
Grant Date -
N/A
app pub date -
Oct 15, 1986
filing date -
Oct 18, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A capacitive occupancy detector apparatus includes a personnel containment device having first and second electrodes which will define an electric field therebetween which will be intercepted by a person present in the containment device. A detecting device is provided for detecting the capacitance formed between the first and second electrodes and a processor is provided for storing the capacitance at predetermined periods. The difference between the last capacitance detected and a capacitance previously stored is detected to determine the presence of a person when the difference indicates an increase of the capacitance exceeding a first predetermined threshold. A second threshold is set based upon the capacitance which determines the presence of a person so that the subsequent determination of the absence of a person is based upon detecting a decrease of the capacitance with respect to the second threshold.
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Family
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Cited Art Landscape
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