Low-power giant magneto-impedance magnetic detector that...

Details Low-power giant magneto-impedance magnetic detector that... Low-power giant magneto-impedance magnetic detector that...

2008-07-29

2008-07-29

Patidar, Jay M (Department: 2862)

Electricity: measuring and testing

Magnetic

Magnetometers

C324S260000

Reexamination Certificate

active

07405559

ABSTRACT:
The present invention is an electrical circuit for a sensor designed to detect external magnetic fields. The circuit is composed of a stable voltage reference source, connected to a low frequency amplifier where the operating point of the amplifier depends on the voltage reference source that is biased for maximum allowable voltage swings of the amplifier. A GMI fiber is connected to the low frequency amplifier and to a crystal oscillator that generates a square wave excitation signal with which to excite the GMI fiber. A decoupling network connected to the amplifier allows stable excitation of the GMI fiber by separating the direct current paths of the amplifier from the excitation signal. When the GMI fiber is excited by the square wave signal the GMI fiber impedance varies with impressed magnetic fields, which in turn varies the output voltage of the amplifier.

REFERENCES:
patent: 5764055 (1998-06-01), Kawase
patent: 5831432 (1998-11-01), Mohri
patent: 6229307 (2001-05-01), Umehara et al.
patent: 6433533 (2002-08-01), Clymer et al.
patent: 6747449 (2004-06-01), Maylin et al.
patent: 6897649 (2005-05-01), Kawase
patent: 6909368 (2005-06-01), Simi et al.

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