Thin film high permeability magnetic core flux gate device for measuring a weak magnetic field
US4967156A · kind A · utility
24Cited by
17References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 17, 1989 |
| Grant date | Oct 30, 1990 |
| Priority date | — |
| Expiry date | May 17, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for measuring a weak magnetic field is disclosed. The device includes a substrate, a magnetic core having a high magnetic permeability and in the form of a surface film on a substrate, and at least two coils magnetically coupled to the magnetic core. A pulse generator is connected to one of the coils and is used to drive the magnetic core into intermittent saturation. The other coil is used to generate an output signal. The device can be used for measuring the weak magnetic fields associated with bank notes for identifying the values of the bank notes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.