Circuit arrangement for signal recovery in a capacitive differen

Details Circuit arrangement for signal recovery in a capacitive differen Circuit arrangement for signal recovery in a capacitive differen

1989-06-26

1991-08-06

Wieder, Kenneth

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324682, 324686, G01R 2726

Patent

active

050381105

ABSTRACT:
A capacitive difference sensor includes two sensor electrodes, each of which lies opposite a transmitting electrode fed by an electrical AC voltage source. A circuit arrangment connected to the two sensor electrodes for signal recovery generates a differential signal which corresponds to the difference between the displacement currents induced in the two sensor electrodes. The circuit arrangement includes a series resonance circuit comprising a coil and a capacitor, the resonance frequency of the series resonance circuit corresponding to the frequency of the AC voltage source. The two sensor electrodes are coupled via a transformer in opposite senses to the series resonance circuit and the differential signal is tapped off at the tap of the series resistance circuit formed by the connecting point between the coil and the capacitor.

REFERENCES:
patent: 3009101 (1961-11-01), Locher
patent: 3039051 (1962-06-01), Locher
patent: 3959723 (1976-05-01), Wagner
patent: 4002996 (1977-01-01), Klebanoff et al.
patent: 4752727 (1988-06-01), Schneider
patent: 4782282 (1988-11-01), Bachman

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