Method and apparatus for locating and tracking chemical containers
Publication Date: 2000-Oct-20
The IP.com Prior Art Database
An apparatus and method are described for a radio frequency chemical inventory control system that enables the location of chemical containers to be automatically and rapidly identified. A host transceiver, controlled via a PC, transmits a coded RF signal, at a first frequency, to individually addressable, low cost, local exciters/transceivers located on shelves or in drawers. The local exciters, which may be sequentially addressed, retransmit the coded RF signal at a second frequency via an antenna. A passive radio frequency identification tag, containing the same code as that transmitted by the local exciter and attached to a chemical container when in the vicinity of the antenna of the local exciter, is energized by the RF field and modulates the second frequency signal from the local exciter. The second frequency signal modulated by the energized tag is then directly received by the host transceiver. A PC, coupled to the host transceiver, enables the system to automatically and rapidly identify, down to a specific shelf or drawer, the location of tagged chemical containers in a laboratory or plant environment.