Magnetic flux measuring method and apparatus for detecting high frequency components of magnetic flux with high speed orientation
US5537038A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 14, 1995 |
| Grant date | Jul 16, 1996 |
| Priority date | — |
| Expiry date | Feb 14, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A current of predetermined frequency is fed to a coil wound around a ferromagnetic core through a fixed impedance means. A magnetic flux measurement is performed in terms of a level of a DC component of a voltage generated across the coil. A DC bias is added to the current of predetermined frequency, and the resultant current is applied through the fixed impedance means to the coil wound around the ferromagnetic core. A magnetic flux measurement is performed in terms of a level of a DC component of the voltage across the coil. A magnetic flux measuring method and apparatus for embodying the same have a high sensitivity in detecting a minute magnetic flux and an improved temperature characteristic because an output voltage little varies against a temperature variation. A magnetic flux measuring method and apparatus for embodying the same, when they are applied to a leakage flux flaw detection using a saturable magnetic flux sensor, is capable of expanding a measuring span of the magnetic flux sensor, thereby to improve a flaw detection performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.