RFID, the best solution for Automatic identification

by Vaibhav Kumar Pragyan Institute of Education

Object tracking and management is the primary function of RFID tags. Radio Frequency Identification tags work on the mechanisms of electromagnetic fields. Till before RFID tags, bar codes were used in the Automatic tagging industry. Then the RFID inventory management solutions, proved such efficient, that it quickly replaced bar codes. RFID gained its popularity in the AIDC industry, completely based on the benefits of electromagnetic signal transmitting. The simple reason behind choosing RFIDs over pre-existing systems is its ability to carry information.

Barcodes and the likes, work on optical signals that are on a frequency lower to EM signals. Meaning they will carry lower volumes of data. On the other hand, X-rays, UV and gamma rays can also carry a huge volume of data. However, they care harmful to human health; automatically, leaving the RFID and its electromagnetic signals, the best choice in sight. 

The science behind RFIDs

The science behind RFIDs is very simple. They work on the fundamentals of signal transmitting and receiving. Hence, every RFID tag maker builds these tagging systems with three critical components. The small RFID labels are attached with the product to be tracked and carry digital information about it. A RFID receiver antenna, that communicates with the label on one end and a computer on the other. And third, an integrated microchip (also in the receiver), in which the product information is written.

How RFIDs work?

All RFID tags and RFID readers in India, work on the same logic. There needs to be a label attached to the intended product. And there needs to be a reader for signal transmission. Commonly, when a product arrives near a reader, the reader transmits signal through its antenna. This signal is essentially an enquiry to the label on the product, asking for product information. The label then replies back with relevant information, via, electromagnetic signals. The received data is then written on the microchip within the reader. Once again, the reader sends the data onto the computer system, where it is taken up for logistics and management purposes.

Types of RFID

Fundamentally RFID has two types -active tags and passive tags. The difference between them is based on their frequency and power management. Active tags work only on 433MHz and 915MHz, where passive RFIDs work on low frequency (125-134 KHz,) high frequency (13.56 MHz) and ultra frequency (865-960 MHz.)

In terms of power management, active RFID tags are powered with its own battery - either a beacon battery that pings signal every few seconds, or a transponder battery that transmits signal only on enquiry by the reader. Passive RFID tags on the other hand depend on RFID readers in India. The passive tag doesn't have a battery of its own, but receives a one-time power shot from the reader for signal transmitting.

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About Vaibhav Kumar Advanced   Pragyan Institute of Education

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Joined APSense since, May 8th, 2016, From New Delhi, India.

Created on Jul 8th 2019 19:47. Viewed 217 times.


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