System for detecting individuals or objects passing through an entrance-exit of a defined space
US7026924B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2001 |
| Grant date | Apr 11, 2006 |
| Priority date | — |
| Expiry date | Mar 3, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C9/28
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
There is disclosed a system for detecting the passage of persons or objects through an entry-exit (4) to a delimited space (2), including (i) a detection device including transmission means (8) for transmitting different first and second electromagnetic signals (a, b) in respectively first and second communication regions (A, B) spatially separated from each other and partially overlapping, (ii) portable electronic units (40) intended to be fitted to said persons or objects and including reception means for said first and second electromagnetic signals, and (iii) means for detecting the direction of passage, through said entry-exit, of a person or an object fitted with a portable electronic unit. Each portable electronic unit includes amplitude measuring means for determining the reception amplitude of said first and second electromagnetic signals and comparator means for comparing the reception amplitude of the first and second electromagnetic signals so as to determine which of these two signals has the highest amplitude.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.