Magnetic sensor using magnetic impedance of magnetic wire within biasing coil
US6121770A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 19, 1998 |
| Grant date | Sep 19, 2000 |
| Priority date | — |
| Expiry date | Jun 19, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a magnetic impedance device according to the present invention, an approximately uniformly biased magnetic field is applied to a sensing part of a magnetic wire in a longitudinal direction by setting the range of winding of a coil. The sensing part is composed of magnetic material with high permeability and is disposed between a pair of mounting pins. The coil is wound around the sensing part of the magnetic wire and generates a biasing magnetic field. The range of winding of the coil is longer than the sensing part. This arrangement allows the sensing part of the magnetic wire to detect external magnetic fields without problems caused by edge effects from the ends of the coil, thereby enhancing the precision of detection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.