Determining stress in ferromagnetic materials from measurements of magnetic anisotropy and magnetic permeability
US5828211A · kind A · utility
7Cited by
1References
10Claims
0Family size
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Key dates
| Filing date | Nov 16, 1995 |
| Grant date | Oct 27, 1998 |
| Priority date | — |
| Expiry date | Nov 16, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L1/125
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The absolute values of biaxial stresses in a ferromagnetic material (16) are measured using a probe (12) which comprises an electromagnet (26), a sensor (32) for stress-induced magnetic anisotropy (SMA) and a sensor (30) for directional effective permeability (DEP). The DEP sensor (30) enables absolute values of stress to be determined; the SMA sensor (32) enables the directions of the principal stress axes to be accurately determined, and improves the accuracy of the stress measurements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.