Metal detector target identification using flash phase analysis
US6172504A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 29, 1998 |
| Grant date | Jan 9, 2001 |
| Priority date | — |
| Expiry date | Jun 29, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/15
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A flash phase analysis circuit provides parallel phase channels for simultaneously analyzing a detected signal in each of several phase windows and providing parallel outputs indicating whether a target falls in one of the phase windows. In one implementation, the parallel outputs each drive a segment of an output device to indicate the target type to the user. The flash phase analysis circuit divides a detected signal among the phase windows and then simultaneously compares the measured signal at each phase window with a reference signal. The circuit matches measured data with pre-selected phase characteristics corresponding to known targets in parallel and provides parallel output signals indicating target type.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.