Autonulling AC bridge using differential and integration feedbac

Details Autonulling AC bridge using differential and integration feedbac Autonulling AC bridge using differential and integration feedbac

1991-10-29

1993-11-23

Strecker, Gerard R.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Using a particular bridge circuit

324 98, 324610, 324651, 324443, 307257, G01R 1706, G01N 2702

Patent

active

052647986

ABSTRACT:
A self-contained autonulling bridge circuit based on phase-sensitive deteon of an impedance to be measured is described. The system utilizes a feedback structure to control a variable impedance in order to establish the null of the bridge. The system utilizes a voltage-variable impedance having both resistance and capacitance and provides the phase sensitive relationship in the control means in order to provide highly accurate measurement of an unknown test impedance. The ability to measure small changes in impedance provides particularly useful application to the area of biological sensor impedance measurement or electrochemical impedance measurement using silicon-based devices.

REFERENCES:
patent: 3473177 (1969-10-01), Ito
patent: 3474334 (1969-10-01), Yokoyama et al.
patent: 3593126 (1971-07-01), May
patent: 4315210 (1982-02-01), Michel et al.

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