Magnetic multilayer strain gage
US5168760A · kind A · utility
28Cited by
1References
10Claims
0Family size
Assignee
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Key dates
| Filing date | Nov 1, 1991 |
| Grant date | Dec 8, 1992 |
| Priority date | — |
| Expiry date | Nov 1, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L1/125
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A strain gauge comprised of a magnetic multilayer assembly exhibiting spialve effect with individual ferromagnetic layers possessing magnetostrictive properties. A magnetic field source is used to bias the magnetic moments of the ferromagnetic layers in a given direction whereby stress applied causes previously antiferromagnetically coupled moments to be angularly realigned toward a ferromagnetic arrangement. Such realignment causes a corresponding resistance change of unexpectedly high magnitude thereby providing a highly sensitive strain gauge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.