Electricity: measuring and testing – Magnetic – Susceptibility
Patent
1994-04-22
1996-04-09
O'Shea, Sandra L.
Electricity: measuring and testing
Magnetic
Susceptibility
324248, 324262, 324259, 324224, G01R 3316, G01R 33035, G01N 2771, G01N 2772
Patent
active
055065007
ABSTRACT:
A coil arrangement having a primary and two balanced secondaries is used to measure ac susceptibility and, using sample movement, also to perform absolute dc moment measurements. Since the same coil arrangement is used for both AC and DC measurements, the measurements can be made successively within a cryogenic chamber without removing the sample. This is a big advantage, because the changed conditions associated with removing and replacing a sample between measurements can cause confusing, uncorrelated results. A high speed voltmeter is used to perform the signal analysis for the moment measurement. The system can be configured to yield high resolution dc moment measurements to 25 ppm and sensitivities to better than 5.times.10.sup.-5 emu.
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Dodrill Bradley C.
Krause John K.
Wang Victor
Lake Shore Cryotronics, Inc.
O'Shea Sandra L.
Phillips Roger
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