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introduction
The daily service of the library involves the management of the flow of people and logistics, and requires a large number of readers and books to be identified, access control, and statistics.
At present, libraries basically use barcode technology as an identification method to achieve these functions. However, although barcodes have the advantages of low price and convenient production, they also have some inherent shortcomings that are difficult to overcome. For example, because they are easy to wear, they must be affixed in the book, which brings inconvenience to use, and is not completely suitable for libraries. The new X-RFID technology that combines XPM and RFID can effectively overcome the shortcomings of barcodes. It has large capacity, high stability and long-life storage performance, and can realize many new functions that cannot be realized by barcodes. The development and utilization of these new functions will help The traditional service work of the library has brought revolutionary changes.
1 Concept and characteristics of X-RFID
That is, radio frequency identification has the advantages of non-contact, long working distance, suitable for harsh environments, and recognizable moving targets. It automatically recognizes the target object and obtains relevant data through radio frequency signals. The recognition work does not require manual intervention and can work in various harsh environments.
Super Permanent Memory (XPM) is a new type of non-volatile memory (NVM) technology. It uses 100% deep sub-micron standard CMOS process, which is the same as manufacturing logic circuits (CPU, DSP, etc.) without adding floating gate process. Practice has shown that XPM products have high reliability and are not easily affected by factors such as temperature, voltage, irradiation, and the number of read operations.
X-RFID adopts XPM technology and applies it to RFID chips, replacing traditional EEPROM with XPM memory as ID code storage device, so that the advantages of XPM memory are concentrated. It can be widely used in logistics, retail, manufacturing, public transportation, medical and health, airports, railways, asset management, identification, security, property rights protection, military and other fields. It has low cost, high process compatibility, and confidentiality. High, physically indelible and other characteristics.
Figure 1 shows the comparison of RFID and X-RFID chip composition.
Compared with other RFID technologies, the RFID system using XPM technology has more advantages (see Table 1).
2 Composition and working principle of X-RFID system
The X-RFID application system consists of four parts: tags, antennas, readers, and data management systems, as shown in Figure 2.
X-RFID tag is the core of radio frequency identification system, also known as radio frequency tag, its English name is TA G, also known as LABEL. The electronic tag is the real data carrier of the radio frequency identification system. Under normal circumstances, radio frequency tags are composed of coupling elements and chips. Each tag has a unique electronic code, which is attached to an object to identify the target object; when it is irradiated by radio frequency signals, it can reflect back to the radio frequency that carries alphanumeric information. Signal for the reader to process and recognize. According to the different power supply modes of the radio frequency tag, it can be divided into active (Active Tag) and passive (PassiveTag). The active tag is equipped with a battery, and the passive tag has no battery.
A reader is an electronic device that reads or reads/writes electronic tags. It is sometimes called a Reading Device, Interrogator, Communicator, or Reading Device. It can be designed as a handheld or fixed type.
The reader is a device for signal generation, transmission, and reception. The radio frequency signal it produces is amplified by a power amplifier and transmitted through an antenna. At the same time, it receives the signal reflected by the tag, and then transmits and receives the signal through the radio frequency receiver. It is demodulated, amplified by the preamplifier, and sent to the readout computer for processing. When the tag enters the magnetic field, the reader sends a set of fixed frequency electromagnetic waves to the tag through the antenna. There is an LC series resonant circuit in the tag whose frequency is the same as the frequency emitted by the reader. Under the excitation of the electromagnetic wave, the LC resonant circuit Resonance occurs, so that there is a charge in the capacitor. At the other end of this capacitor, a unidirectional electronic pump is connected to send the charge in the capacitor to another capacitor for storage. When the accumulated charge reaches 2 V, This capacitor can be used as a power supply to provide working voltage for other circuits, transmit data in the card or receive data from the reader, restore the object information in the tag, so as to achieve the purpose of identifying the object. The antenna of the reader can be built-in or external.
The working frequency band of X-RFID, for radio frequency identification system, the most important frequency is 0 ~ 135 kHz, and ISM frequency 6. 78 MHz, 13. 56 MHz, 27. 125 MHz, 40. 68 MHz, 433. 92 MHz, 869.0 MHz, 915.0 MHz (not used in Europe), 2. 45 GHz, 5.8 GHz and 24. 125 GHz.
3 Application of X-RFID in the library
The use of RFID technology to automate library operations must require RFID tags to have extremely high requirements for data storage period, cost tolerance, data security, etc. According to the current most common RFID based on EEPROM technology Labels have shortcomings such as short data storage time, low security, high cost, and easy data loss. Therefore, among various RFID technologies, the use of XPM technology is the most suitable for RFID library management system. This not only effectively solves the data storage period and security, but also relatively reduces the operation and implementation costs of the RFID library management system. At the same time, it also provides sufficient conditions for the wide application of RFID in the library industry.
X-RFID technology is mainly used in libraries for self-service borrowing stations, self-service book return boxes, counter workstations, collection sorting systems, machine inspection service stations, electronic security doors, bookshelf management systems, etc. The intelligent library management system based on X-RFID is shown in Figure 3.
X-RFID tags can provide convenient data management, and have anti-theft protection; the antenna mainly provides security work at the entrance and exit, it can accurately identify the book title of each book that triggers the alarm, and truly alarm without error; The workstation is for the administrator to read the RFID code of the book when going through the procedures of borrowing and returning the book. It is convenient for the librarian to carry the handheld code reader to capture the information of the smart label on the book at any time, quickly search for the book, and put the book shelf in disorder Book management categorization; self-service borrowing and returning machine allows readers to go through the borrowing procedures by themselves. It consists of a library card reader, RFID reader, touch screen and a receipt printer; automatic sorting system, using The reader recognizes the tags to achieve the purpose of automatic sorting; the application software uses the SIP2 interface to connect with the LAS and other components through the Ethernet interface to connect the intelligent library management system and the library’s circulation automation system, giving Convenience for readers and librarians.
4 Advantages of using X-RFID system
4. 1 The process is simplified and the efficiency is improved
The current loan and return process generally uses a barcode scanning system. The collection of barcode data is done through a fixed or hand-held barcode scanner. The barcode is easily damaged and is only suitable for short-distance, static, and small data collection. In addition, the scanning operation requires manual labor. Open the book and find the barcode position to scan, the operation process is relatively cumbersome, and the efficiency of borrowing and returning the book is low. The introduction of X-RFID technology can realize a dynamic, fast, large data volume, and intelligent book borrowing and returning process, improving the security of information storage, the reliability of information reading and writing, and the speed of borrowing and returning books.
4.2 System improvement, improved safety
Use X-RFID technology to improve the existing management system, link the anti-theft system with the book circulation management system, and record the entry and exit history of each book, so that it can be matched with the history of borrowing and returning books.
It can effectively improve the accuracy of the anti-theft system and ensure the safety of books.
4. 3 Reduce workload and improve job satisfaction
The work of library staff is very heavy due to the repetitive work over the years. For example, relying on manual book inventory to have a heavy workload, it is easy to have certain negative thoughts about the work; in addition, readers also express dissatisfaction with the library, which leads to books Satisfaction with library work has declined. Through the transformation of X-RFID technology, the staff can be liberated from the daily heavy and repetitive work of the library, and at the same time, the reader’s satisfaction with the library work can be improved.
4. 4 Electronic tags have strong data retention and long code life
Due to the physically non-erasable method, compared to the use of high-voltage electrical boxes to store data, the RFID data using EEPROM technology can be stored for up to 10 years, while the data retention of X-RFID can reach more than 100 years. Due to the non-contact reading method, coupled with the characteristics of waterproof, anti-magnetic, and high temperature resistance, the life of RFID electronic tags is much longer than that of bar codes. Each electronic tag can be read more than 100,000 times at least. In this way, once the electronic label is affixed, it can be used for a long time.
5 Conclusion
Due to the current development status of libraries in China, the promotion and application of X-RFID in the field of libraries in China is restricted by various factors, and it will take a long time to realize it. However, X-RFID can enable the library to realize truly intelligent management. Through X-RFID technology, it can provide readers with simple and rapid self-service, improve the work efficiency of librarians, save manpower for the library, and provide safety for readers. environment of. The unique advantages of X?? RFID are unmatched by other identification technologies. X-RFID system is the development trend of library management system. It will eventually replace and eliminate the currently widely used barcode identification technology, the application of X-RFID technology Will promote the construction and development of digital libraries in our country.
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