Will RFID technology in the library field eliminate barcodes?RFID Chip wholesale

　　Compared with barcode technology, RFID technology is a widely used automatic identification technology. Although it has made great contributions to improving the efficiency of book circulation, it has some insurmountable defects. Its application in the library field will surely become history, and it will be replaced by a brand new concept brought by RFID technology to library management.

　　1 Bar code recognition technology

　　bar code is composed of a group of bars and empty symbols arranged according to a certain coding rule, which represents certain characters, numbers and symbol information, so there is little information stored. The bar code system is an automatic identification system composed of bar code symbol design, bar code making and scanning and reading. When in use, the scanner is aligned with the bar code to obtain relevant information.

　　barcode recognition technology is by far the most widely used automatic recognition technology. So far, there are about twenty kinds of common barcode symbologies, among which the widely used symbologies include EAN code (European commodity barcode), Code39 code, cross 25 code, UPC code, 128 code, Code93 code, and CODABAR Code etc.

　　2 RFID identification technology

　　RFID is a non-contact automatic identification technology called "(wireless) radio frequency identification", named after its English abbreviation "Radio Frequency Identification".

　　RFID's history can be traced back to the first time the US military used it to identify Allied aircraft during World War II. In the 1970s, the West German government used it to mark nuclear waste to track their processing more accurately. In Singapore and Hong Kong, the electronic road toll system based on this technology has also been put into use. The system can implement differential charging for vehicles traveling on different road sections at different times. In addition, it has been widely used in pet identification, wildlife and environmental monitoring and other fields, and is now more and more widely used in the field of book management. The basic RFID system is composed of three parts: tag (Tag), reader (Reader) and antenna (Antezm), which are fully or partially integrated into a whole-in actual applications, other hardware and software support are also needed. Due to the closed packaging of RFID, it can be used in humid and polluted environments.

　　(1) Tag (tag, card). Tag is divided into active type and passive type. In the RFID system, the RFID unit that does not actively transmit RF signals to the reader is called a passive tag, and the RFID unit that actively transmits RF signals to the reader is called a Transponder, that is, an active tag. Passive Tag An RFID unit that only performs RF signal reflection or backscatter transmission. Active Tag requires a dedicated battery to support the work of its transmitter and receiver. Tag contains relevant information data that can be used to authenticate and identify the attached target. Tag can be read-only, read-write or write.

　　Smart rfid electronic tag

　　(2) Interpretation (Reader). RF Transceiver (transceiver) is the source of RF energy. It generates RF signals and RF energy to activate and support (power to) the work of "passive RFID Tag. When used as a stand-alone device, it is generally classified as an RF module. The task of RF Transceiver is to perform the operation of the radio frequency transmitted and received by the antenna. Control and modulation and decoding; filter and amplify the RF signal reflected or backscattered from the "passive" RFID Tag. The task of the RFID reader is to control the RF Transceiver to transmit the RF signal: receive the encoded code from ag through the RF Transceiver The RF signal decodes the authentication and identification information of the Tag; transmits the authentication and identification information together with other relevant information on the Tag to the host for processing.

　　(3) Antenna. The RFID system should include at least one antenna, internal or external, to transmit and receive RF signals. Some RFID systems use one antenna to complete the transmission and reception at the same time; while other RFID systems use one antenna to complete the transmission and another antenna to undertake the reception.

　　Smart rfid antenna

　　The working principle of RFID is not complicated. After the tag enters the magnetic field, it receives the radio frequency signal from the reader, and sends the product information (passive tag or passive tag) stored in the chip by means of the induction flow, or actively sends a signal of a certain frequency (With tags or active tags); After the reader reads and decodes the information, it is sent to the central information system for relevant data processing. RFID is similar to barcode description. For barcode technology, it is to attach the coded barcode to the target, and use a dedicated scanning reader and light signal to transmit the information from the bar magnet to the scanning reader; while RFID uses a dedicated BFID to read and write The device and a special RFID unit that can be attached to the target use RF signals to transmit information from the BFID unit to the RFID reader.

　　RFID unit contains various related information, such as the name of the book in the book management, the start and end time of the book borrowing, the specific time when the book passes through the reading room and the library passes through a certain place in the library. RFID units, tags, cards, etc. can be flexibly attached to any position of the identifier. The tag with RFID only needs to stay within the electromagnetic wave coverage of the reader for a certain period of time to complete the identification process.

　　3 Comparison of RFID and barcode technology

　　The tremendous changes that barcode technology has brought to people's work and life are obvious to all. However, because the information capacity of the barcode is relatively small, for example, the barcode on a book can only accommodate a few or dozens of Arabic numerals or letters, so a one-dimensional barcode can only identify a type of book, and does not contain a description of the book. Only with the aid of the database, people can get the description of the book through the barcode. In other words, if you leave the pre-established database, the information contained in the one-dimensional barcode will be greatly reduced. For this reason, the use of one-dimensional barcodes is quite restricted in places where there is no database support or the networking is inconvenient.

　　On the other hand, one-dimensional barcodes cannot express Chinese characters or image information. Therefore, in some occasions where Chinese characters and images need to be used, one-dimensional barcodes are very inconvenient. Moreover, even if we have established a considerable database to store Chinese characters and image information of related products, these large amounts of information require a very long bar code for identification. And this kind of long barcode will take up a large printing area, which brings difficult problems to printing and packaging. Therefore, people hope that the barcode directly contains various information of the book, and does not need to query the information again from the database based on the barcode.

　　Compared with barcode recognition systems, radio frequency identification technology has many advantages: automatic identification of target objects through radio frequency signals, no visible light source; penetrability, can directly read data through external materials, protect external packaging, and save time; radio frequency The product can work in harsh environments with low environmental requirements; the reading distance is long, and data can be obtained without contact with the target; it supports writing data without re-making new tags; using anti-collision technology, it can handle multiple radio frequencies at the same time The tag is suitable for batch identification occasions; it can track and locate the object attached to the RFID tag, and provide location and other information.

　　Broadway smart rfid smart bookshelf

　　The use of RFID technology in library book management is more advantageous than bar code technology.

　　(1) It is easier to use. When using barcodes to identify books, the scanner must "see" the barcode of the book in order to read the information. Therefore, library managers must scan each book by hand, which is not only inefficient, but also prone to errors. RFID can read data remotely through the external materials of the book, and can work in harsh environments.

　　(2) Higher efficiency. Barcode technology can only scan the information of one book at a time, and RFID can also process multiple tags at the same time, which can be processed in batches in an instant. In addition, RFID writes and accesses data less than barcodes and is more efficient.

　　(3) More information. The information capacity of barcode is limited. One-dimensional barcode is 50 bytes, and the maximum capacity of two-dimensional barcode can store 2 to 3000 bytes. Usually it can only record book characteristic codes, and it must be connected to the database for identification and processing to store data. The volume is large, which can reach megabytes, and can easily store the text, pictures and other related information of the book.

　　(4) Better fault tolerance. After the barcode information is printed, it cannot be changed, and it cannot be changed due to various variable factors. The book information using the RFID TAG book electronic tag can be added, modified, and deleted an unlimited number of times. The data stored in the RFID TAG and the content of the RFID It can be dynamically changed anytime, anywhere.

　　(5) Longer durability. If the barcode is torn, defaced or lost, the scanner will not be able to scan and identify the book. RFID uses packaging technology, which can be placed on the inner page of the book, and it is not easy to damage. Barcode ends with the end of the life of the book, and RFID can be recycled and reused.

　　(6) Anhe is more confidential. RFID data access is protected by a password, which is not easy to be forged and changed. The book data is more secure, and the book attached to the RFID tag can be tracked and located to prevent the book from being lost.

　　It can be clearly seen that compared with barcode technology, RFID in the library field has irrefutable advantages, all of which are very suitable for the requirements of modern book management. As history, barcode has completed its historical mission and will withdraw from the stage of book management. Return to Sohu to see more

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