Comparison of RFID electronic tags and barcodes
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Bar code technology, one of the automatic identification systems, has matured more than 30 years ago, but few companies were willing to adopt it. Until 1984, large retailers such as Wal-Mart forced their suppliers to adopt the technology. The application of the code has expanded rapidly. Now, as the world's top commodity retail giants Wal-Mart, Chris, and Metro, the products offered by their suppliers must have RFID (Radio Frequency Identification) tags. This is undoubtedly the market demand to promote Wal-Mart to choose a more advanced automatic identification technology. Compared with the contact bar code technology, RFID is a non-contact automatic identification technology. Its powerful function, large information capacity, and readable and writable performance make it more advantageous in commodity circulation.
From the bar code technology to the RFID technology, the library automation has reached a qualitative leap after a long transition: with the RFID technology, the library in Singapore has increased the borrowing rate by 30 times and saved 28 million dollars per year. Labor costs for 2,000 staff members.
Introduction to 1 barcode and RFID electronic label
1.1 barcode system
A bar code system is a binary code that consists of parallel lines and spaced gaps. A sequence of wide and narrow lines or gaps can be interpreted in numbers/letters. It is read by a laser scanner (which we now call a "light pen"), ie by different reflections of the laser on the black lines and white gaps. Although their physical structure is the same, there is a clear distinction between the code structures of the approximately ten types of bar codes used today, and the library uses bar code 39.
1.2 RFID electronic label
The RFID electronic tag consists of a tag antenna (or coil) and a tag chip. The chip is a single-chip system with wireless transceiver and storage functions. It stores electronic data in a certain format and can identify information as needed. RFID electronic tags are classified into passive tags and active tags. The library uses passive tags (the following tags refer to such tags). After receiving the signal from the reader, the tag transmits the information stored in the chip by the energy obtained by the induced current, so it is also called a passive tag. The RFID electronic tag can be made into various shapes and sizes, is extremely thin, has flexibility, and can be adhered to various information carriers other than metal, and has high safety.
2 Comparison of the advantages and disadvantages of the two
When the light pen reads the bar code, the manual operation is low, the efficiency is low, and one bar is processed one by one, which is easy to make mistakes, labor intensity is large, and is affected by environmental conditions. In comparison, the RFID electronic tag has more advantages: its reading It does not need visible light source, has penetrability, can directly read information through external materials, can process multiple RF tags at the same time, batch processing, simplify labor intensity, and track item position in real time, with very low error and environmental conditions. The impact is not great. The pros and cons of the two can be seen in the above table.
3 RFID electronic label problems and development prospects
From bar code to RFID tag, it has also experienced the process of continuous development, exploration and improvement of bar code - bar code + RFID tag - RFID tag. RFID technology and library information system provide a very good opportunity for creating digital and automated libraries, but there are still some problems in RFID electronic tags that need to be solved:
(1) Privacy issues: transparent management, effective cost reduction, security is very interesting.
(2) Breakthrough in technology: According to a survey conducted by the agency Auto-ID Center, even if double-labeled, 3% of RFID cannot be read; only 78% of the label with one label is correctly read. Out. In addition, RFID electronic tags and readers have directionality and RF signals are easily blocked by objects, which is also a major challenge for the future development of RF technology.
(3) Cost reduction: At present, the price of RFID electronic tags is still very high. RFID electronic tags are classified into 0, 1, 2, 3, 4, and 5. The higher the number, the more functions, The price is also higher.
(4) Formulation and implementation of international standards: Common library RFID; electronic label specifications are IS015693 standard, 128b~EEPROM, 13.56MHz operating frequency. The application of RFID electronic tags in the library, although it still has certain problems, I believe that in the near future, with the continuous improvement of technology, the degree of library automation, intelligence, and digitization will be greatly improved, and its development prospects are Broad.