Magnetic property characterization system employing a single sensing coil arrangement to measure both AC susceptibility and DC magnetization
US5506500A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1994 |
| Grant date | Apr 9, 1996 |
| Priority date | — |
| Expiry date | Apr 22, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/16
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.