Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1987-06-05
1988-11-15
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 2922
Patent
active
047852321
ABSTRACT:
A method and apparatus for the contactless, non-destructive measurement of Hall coefficient and resistivity of a piezoelectric semiconductor sample. The material to be tested is formed in a disk which is supported at its edge by a holder. The disc is free to vibrate. Two pairs of electrodes, placed above and below the sample, excite the sample into and beyond piezoelectric resonance. Then a magnetic field is applied to the sample and the sample again driven into and beyond resonance. Comparison between the performance of the disk before and after application of the magnetic field yields data from which Hall coefficient can be determined.
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Ballato Arthur
Leupold Herbert A.
Edmonds Warren S.
Eisenzopf Reinhard J.
Kanars Sheldon
Rehberg John T.
The United States of America as represented by the Secretary of
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