Capacitive occupancy detector apparatus

Details Capacitive occupancy detector apparatus Capacitive occupancy detector apparatus

1986-10-15

1989-01-03

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

180272, 307 10R, 340540, G08B 2100, G08B 1326

Patent

active

047960132

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.

REFERENCES:
patent: 3898472 (1975-08-01), Long
patent: 4476461 (1984-10-01), Carubia
patent: 4491841 (1985-01-01), Clark

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