Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1986-03-03
1988-09-06
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
Magnetometers
310323, G01R 3302, H01L 4104, H02N 200
Patent
active
047695994
ABSTRACT:
A highly sensitive magnetometer employs a magnetostrictive amorphous metal core in which a piezoelectric driver induces stress variations. In the presence of an external magnetic field, the magnetization of the magnetostrictive core varies in relation to the induced stress. The amplitude of the variations in magnetization is proportional to the strength of the external field and is sensed by a pick-up winding disposed around the magnetostrictive core. The dynamic range of the device is improved by employing a bucking field winding around the core to null out the magnetization of the core. In contrast to the inherent non-linear characteristic of the conventional fluxgate magnetometer, the invention inherently provides a linear response to magnetic field strength.
REFERENCES:
patent: 2334593 (1943-11-01), Wyckoff
patent: 2834943 (1958-05-01), Grisdale et al.
patent: 4065757 (1977-12-01), Kardashian
patent: 4142571 (1979-03-01), Narasimhan
patent: 4443731 (1984-04-01), Butler et al.
"Proposal for Detection of Magnetic Fields Through Magnetostrictive Perturbation of Optical Fibers," Amnon Yariv, Harry V. Winsor, Optics Letters, vol. 5, No. 3, Mar. 1980, pp. 87-89.
"Metallic-Glass Fiber Optic Phase Modulators," Frank R. Trowbridge, Ronald L. Phillips, Optics Letters, vol. 6, No. 12, Dec. 1981, pp. 636-638.
Eisenzopf Reinhard J.
Geo-Centers, Inc.
Snow Walter E.
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