Capacitor detector device

Details Capacitor detector device Capacitor detector device

1975-02-14

1976-08-03

Heyman, John S.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340258B, 331 65, G08B 1326

Patent

active

039732088

ABSTRACT:
A capacitor detector device for detecting a change of capacitance in a protected zone, which device comprises an antenna element adapted to be mounted in spaced relationship with a grounded element to define the protected zone between the elements and having a nominal capacitance therebetween, which capacitance is changed upon intrusion of an object to be detected. The device includes an oscillator means for pumping, at a preselected frequency, the grounded element with respect to an internal floating ground of the device, means for connecting the antenna to the floating ground of the device whereby the antenna is capacitively coupled to the pumped ground element and means for detecting changes in the capacitive coupling of selected amounts between the antenna element and the pumped grounded element.

REFERENCES:
patent: 3462692 (1969-08-01), Bartlett
patent: 3675051 (1972-07-01), Mioduski
patent: 3743865 (1973-07-01), Riechmann

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