Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1983-10-04
1984-09-11
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361143, 361267, H01F 1300
Patent
active
044714033
ABSTRACT:
A dual-function circuit is provided which may be used to both magnetically bias and alternately, quickly degauss a magnetic device. The circuit may be magnetically coupled or directly connected electrically to a magnetic device, such as a magnetostrictive transducer, to magnetically bias the device by applying a d.c. current and alternately apply a selectively damped a.c. current to the device to degauss the device. The circuit is of particular value in many systems which use magnetostrictive transducers for ultrasonic transmission in different propagation modes over very short time periods.
REFERENCES:
patent: 3588624 (1971-06-01), Marvin
patent: 3784868 (1974-01-01), Swinkai et al.
patent: 3895270 (1975-07-01), Maddox
"Degaussing Circuits for Color Television Receivers", Robert F. Blaha, IEEE Trans. Broadcast and Tel. Rec., (USA), vol. BTR 18, No. 1, Feb. 1972.
Dress, Jr. William B.
McNeilly David R.
Breeden David E.
Eisenzopf Reinhard J.
Esposito Michael F.
Hamel Stephen D.
The United States of America as represented by the United States
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