Electrical bridge balancing circuit

Details Electrical bridge balancing circuit Electrical bridge balancing circuit

1979-02-26

1981-08-11

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324225, 324233, G01N 2772, G01R 3312

Patent

active

042836808

ABSTRACT:
An electric sensing circuit, typically a metal detector includes a bridge including inductors. The out of balance condition of the bridge is stored on a capacitor and a balancing signal is fed to balance the bridge in dependence upon the stored value of the charge. The stored value of the charge is only updated in response to relatively slow changes in the out of balance condition of the bridge. Relatively rapid changes in the out of balance condition are used to provide an output signal for alarm or measuring purposes, and the arrangement is thereby so arranged that the balancing signal does not attempt to automatically balance out the output signal giving the alarm or measurement.

REFERENCES:
patent: 2489920 (1949-11-01), Michel
patent: 2768347 (1956-10-01), Hansen
patent: 4006407 (1977-02-01), Flaherty et al.

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