Methods and apparatus for measuring flexural wave and/or flexural vibration using a magnetostrictive sensor
US6868730B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 2003 |
| Grant date | Mar 22, 2005 |
| Priority date | — |
| Expiry date | May 29, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01H11/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed is an apparatus or a method for measuring flexural waves and/or vibrations acting on ferromagnetic materials or ferromagnetic films. The present invention includes a bias magnet disposed around the ferromagnetic material so as to form a magnetic field in accordance with a stress distribution pattern occurring as the flexural wave propagates along the above said ferromagnetic material, and a measuring device for measuring the time-varying change of the magnetic induction resulting from the propagation of flexural waves on the ferromagnetic material. In addition to the above components, the bias yoke can be disposed around the ferromagnetic material to support the function of the magnet and the formation of the magnetic circuit as a measuring device for the change of the magnetic induction. In addition, a fixed electromagnet can be used as the bias magnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.