Apparatus for testing magnetic properties of sheet material such as bank notes or papers of value
US5670880A · kind A · utility
1Cited by
5References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 16, 1996 |
| Grant date | Sep 23, 1997 |
| Priority date | — |
| Expiry date | Jan 16, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
For measuring magnetic properties of sheet material the sheet material is guided past a magnetic measuring system at a measuring distance defined between the sheet material and the magnetic measuring system. The sheet material is transported with a transport medium disposed between the measuring system and the sheet material. The measuring distance is determined substantially by the thickness of the transport medium. The thickness of the transport medium is selected to be smaller than a predetermined local resolution. If the local resolution is high enough it is also possible to detect magnetic printed images.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.