Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1991-02-25
1992-08-18
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Magnetometers
324252, 338 32R, 338 32S, 505845, H01B 1202, H01L 3912, H01L 3916, G01R 33035
Patent
active
051402670
ABSTRACT:
A magnetic field distribution measuring apparatus for measuring an external magnetic field distribution includes a substrate made of a nonmagnetic material and having opposite surfaces, a plurality of magnetoresistive elements deposited on one surface of the substrate and each made of a superconductive material having a weak coupling at the grain boundaries. Coils are provided on the other surface of the substrate at positions corresponding to the magnetoresistive elements. The coils are sequentially applied with AC current to produce AC magnetic field having a peak value greater than a magnetic field threshold level at which the magnetoresistive element changes the state from a superconductive state to a magnetoresistive state. Detecting the degree of magnetoresistive from each magnetoresistive element, the magnetic field distribution can be detected.
REFERENCES:
patent: 4749946 (1988-06-01), Hoenig
T. Ishiguro, et al. "Advances in Superconductivity II", Proceedings of the 2nd International Symposium on Superconductivity, Nov. 1989.
Sharp Kabushiki Kaisha
Snow Walter E.
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