Method and system for sliding door pattern cancellation in metal detection
US8264353B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 2010 |
| Grant date | Sep 11, 2012 |
| Priority date | — |
| Expiry date | Mar 12, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/38
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and system for reducing the signal interference effects of metal doors in a metal detection system. The system includes a transmitter operable to transmit an interrogation signal that is used to detect transitory metal objects within the detection region, a receiver operable to receive instantaneous signals that represent electromagnetic field disturbances during operation of the metal detection system and include electromagnetic field disturbances attributed to the movement of metal doors. The system also includes a metal detection module that determines a resulting waveform representing the difference between the instantaneous signals received during operation of the metal detection system and a recorded pattern of signals representing electromagnetic field disturbances caused by a pattern of movement of the metal doors in the detection region when a transitory metallic object is not present. The record pattern is canceled from the resulting waveform leaving only signals from transitory metal objects.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.