INTRODUCTION:
More than any other discipline, computer science jumps from one technology to another. Some will die early, some will remain longer. During the last years, the increasing use of Radio Frequency as a means of identifying objects, placed this technology close to the latter category. According to many experts RFID (or Radio Frequency IDentification) matured and is in the process of becoming one of our everyday-life partners.
Radio frequency identification is a technology that uses a radio wave to transfer data from electronic tag called RFID Tag attached to a object through a reader for the purpose of identification. RFID reader transmit encoded radio signal to interrogate the tag. The Tag receives message and responds with it identification. The tag information stores electronically.
HISTORY :
Radio Frequency IDentification (RFID) is part of the more general Automatic Identification systems (also known as Auto-ID systems). Auto-ID systems are not new. However, these systems are becoming more and more popular in many business areas. In short, the term Auto-ID groups the technologies helping computer to identify objects, animals or people1. In use since the seventies2, Automatic Identification procedures were developed in order to create means of providing information about objects in transit. Figure 13 offers an overview of existing Auto-ID technologies.
Barcodes. Technically speaking, the barcode comprises a field of bars and empty spaces, vertically printed on a sticker or a product label. The sequence (bars, gaps) as well as the width of the sticks are converted into an ASCII4 sequence using optical lasers and a complex set of mirrors. Barcodes are a
worldwide available and popular mean of identifying objects since the late seventies. There is a simple reason for this long-lasting success: barcodes have been made of paper and ink which makes these tags cheaper that any other Auto-I system Many barcodes...
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