Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1988-02-08
1990-07-03
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324226, 324235, 505726, 505842, 7386261, G01N 2772, G01R 3312
Patent
active
049394584
ABSTRACT:
The invention relates to a novel apparatus for detecting as well as quantifying superconductivity characterized by a rigid-stemmed pendulum used to support the superconductive sample for free-swinging movement about a low-friction fulcrum in a magnetic field effective to swing the pendulum to one side, connecting both a first mechanism to the pendulum operative to sense the movement of the pendulum and generate a signal proportional thereto along with a second mechanism effective to receive such a signal from the first mechanism and react thereto in a manner to null the movement of the pendulum along with the sample suspended therefrom, and, finally, connecting a signal processing mechanism into the system whereby the signal generated by the first mechanism is quantified as a measure of the superconductive properties of the sample. The invention also encompasses the method for detecting and quantifying the superconductive properties of a purportedly superconductive sample which includes suspending the sample from a rigid-stemmed pendulum within a magnetic field effective to repel same when exhibiting the Meissner Effect, detecting the repelling force tending to swing the pendulum and measuring it as a quantification of the Meissner Effect force present in the superconductive sample, and nulling the swing of the pendulum by applying an oppositely-acting force thereto equal to the repelling force.
REFERENCES:
patent: 2946948 (1960-07-01), Foner
patent: 3431489 (1969-03-01), Bridges
patent: 3609526 (1971-09-01), Chaberski
patent: 3976934 (1976-08-01), Voigt
Moon: "Hysteretic Levitation Forces in Superconducting Ceramics", Appl. Phys. Lett., May 2, 1988.
Barsoum: "Use of the Meissner Effect to Separate, Purify and Classify SC Ponders", Appl. Phys. Letters., Dec. 7, 1987.
Hellman "Levitation of a Magnet Over a Flat Type II SC", Bell Labs Tech. Report, Sep. 1987.
Bird Herbert R.
Yarar Baki
Colorado School of Mines
Eisenzopf Reinhard J.
Hanes Richard W.
Solis Jose M.
Spangler, Jr. Edwin L.
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