Evaluation circuit for a capacitive sensor

Details Evaluation circuit for a capacitive sensor Evaluation circuit for a capacitive sensor

1990-11-30

1992-12-15

Strecker, Gerard R.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324663, 324676, G01R 2726

Patent

active

051720655

ABSTRACT:
In an evaluation circuit for a capacitive sensor, the capacitive sensor and a capacitor form a capacitive voltage divider, the end terminals of which can be fed with opposite-phase alternating voltages of the same frequency. The junction point between the capacitor and the capacitive sensor is connected, together with a tap of a voltage source of high internal resistance, to the input of an impedeance transformer. The output of the impedance transformer is connected to a synchronous demodulator to which at least one phase of the alternating voltage is fed.

REFERENCES:
patent: 4243114 (1981-01-01), Brouwer

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