Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1989-06-16
1992-07-14
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Magnetometers
G01R 3302, H01L 4104, H01N 200
Patent
active
051306549
ABSTRACT:
A single magnetostrictive amorphous metal sensor element is mounted on a piezoelectric resonator plate with an intervening layer of a viscous fluid, an oscillator stresses and vibrates the plate at a resonant frequency, creating a standing wave in the sensor element which is a metallic glass ribbon. Electromotive forces are generated in first and second pickup coils mounted at symmetrically spaced positions about the ribbon centerline. The electromotive force generated by each pickup coil is demodulated by a lock-in amplifier with a signal supplied by the oscillator. The demodulated outputs are amplified so as to balance the sensitivities. Outputs of amplifiers are provided to a differential amplifier which produces the gradiometer output indicative of magnetic field gradient.
REFERENCES:
patent: 2976483 (1961-03-01), Moore et al.
patent: 3778761 (1973-12-01), Cribbins
patent: 3863142 (1975-01-01), Werle
patent: 3919630 (1975-11-01), Oshima et al.
patent: 4280095 (1981-07-01), Hinton
patent: 4323848 (1982-04-01), Kuckes
patent: 4386318 (1983-05-01), Burbank et al.
patent: 4605899 (1986-08-01), Eumurian et al.
patent: 4611171 (1986-09-01), Woods
patent: 4656421 (1987-04-01), Ellis et al.
patent: 4693000 (1987-09-01), Hoenig
patent: 4703266 (1987-10-01), Chiron et al.
patent: 4769599 (1988-09-01), Mermelstein
patent: 4804915 (1989-02-01), Hoenig
Mermelstein and Dandridge, "Low-frequency magnetic field detection with a magnetostrictive amorphous metal ribbon", Appl. Phys. Lett., 51: 545-547 (U.S.A. 1987).
Snow Walter E.
University of Virginia Alumni Patents Foundation
Wray James C.
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