86457
Beschreibung
Karteikarten von Poppy Venables, aktualisiert more than 1 year ago
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Erstellt von Poppy Venables
vor mehr als 11 Jahre
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| Frage | Antworten |
| Radio frequency identification (RFID) is a method of identification that uses tags stuck onto a product, in order to store data that can be retrieved by a reader. RFID is often used to track pallets of products from the manufacturer to the retailer. | It also has applications in libraries, where a tag is used on a library book to identify the book and lender, which proves useful as a security system. |
| RFID is based on a transmission and reception of radio frequency (RF) signals between a transmitter (the reader) and a transponder (the tag)(which is attached to the product). | In most cases this transmission is 2-way: the transmitter(the reader) sends signals, which the transponder(the tag) receives. The transponder(the tag) then transmits a response signal that is received by the transmitter(the reader). The info from the transmitter(the reader) can then be used to identify the transponder(the tag) and the product attached to it. |
| Active Transponders: are battery powered and can be read over a great range, several tens of metres. They are typically expensive and are usually only used on vehicles and shipping containers. Battery powered; therefore it has a limited lifetime. | |
| Passive transponder: take the power they need to respond from the electromagnetic signals transmitted from the receiver. The strength of the signal falls quickly and has a limited read range. Commonly used for tracking pallets and library books. |
Image:
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