Speed-independent static magnetic field metal detector
US3972156A · kind A · utility
28Cited by
6References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 24, 1975 |
| Grant date | Aug 3, 1976 |
| Priority date | — |
| Expiry date | Feb 24, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S56/15
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A static magnetic field detector for harvesting machines senses the passage of ferrous or magnetic objects utilizing a balanced magnetic field excitation configuration which provides substantial self-cancellation of spurious background signals. A novel filtering means provides normalization of the fluctuations in the background noise due to the variations in the angular velocity of the rotating harvesting machine components. Additionally, the detector apparatus is disposed within a compressor feed roll of the machine thereby reducing the area which must be scanned and increasing the sensitivity of the device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.