Search head for metal detectors
US4959636A · kind A · utility
2Cited by
6References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 15, 1988 |
| Grant date | Sep 25, 1990 |
| Priority date | — |
| Expiry date | Dec 15, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/107
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A search head for a metal detector, the head comprising a support body and three conductive loops mounted on the body, the loops being formed from a single ribbon cable. An oscillating signal is applied to one of the loops and induced voltages in the other two loops are subtracted, the arrangement being such that a difference will appear in the subtracted voltages when a metal object is closer to the other two loops.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.