| 摘要 |
<p>A system for automated identification of articles such as baggage or carrier cargo. The system uses the principle of electromagnetic communication in which an interrogator (1) containing a transmitter (2) generates an interrogation signal which is conveyed to an electromagnetic field creation system (3) to provide an interrogation field (4) which is coupled to an electronically coded label (5) attached to an object (6) which may be moving on a conveyor (7). Label (5) contains an electromagnetic coupling element and an electronic circuit which may use a rectifier to generate a dc power supply for operation of a reply generation circuit within label (5). That circuit produces a reply signal, containing information previously encoded into label (5), which either through the electromagnetic coupling element or a separate coupling element, generates in the vicinity of label (5) a reply electromagnetic field (8). As a result of the electromagnetic coupling between the reply field and either field creation system (3) or a separate field detection system (9), a portion of the reply signal generated by label (5) enters interrogator (1), and in a signal separator (10) which may be located within or externally to interrogator (1) may be separated from the interrogation signal and passed to a receiver (11) wherein it is amplified and decoded to determine the information encoded into the reply.</p> |
