Apparatus and method for measuring properties of a ferromagnetic material
US9851265B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 24, 2013 |
| Grant date | Dec 26, 2017 |
| Priority date | — |
| Expiry date | May 12, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for measuring material properties of an object of ferromagnetic material, the apparatus including a probe, the probe including an electromagnet core defining two spaced-apart poles for inducing a magnetic field in the object, and a drive coil wound around the electromagnet core, and means to supply an alternating electric current to the drive coil to generate an alternating magnetic field in the electromagnet core and consequently in the object, wherein the probe also includes two sensing coils arranged in the vicinity of each of the poles, for sensing the magnetic flux density that links the core and the object, such sensing coils are significantly more sensitive to changes in material properties than are sensing coils overwound onto the drive coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.