The role of RFID

　　The role of RFID

　　The working principle of RFID is: after the tag enters the magnetic field, if it receives a special radio frequency signal from the reader, it can send out the product information stored in the chip with the energy obtained by the induced current, or actively send a signal of a certain frequency, After the reader reads and decodes the information, it is sent to the central information system for data processing. A complete set of RFID system is composed of three parts: reader and electronic tag, so-called transponder and application software system. Its working principle is that the reader transmits radio wave energy of a specific frequency to the transponder, and uses To drive the transponder circuit to send the internal data, at this time, the reader will receive the interpretation data in sequence and send it to the application program for corresponding processing. To put it simply: after the tag enters the magnetic field, if it receives a special radio frequency signal from the reader, it can use the energy obtained by the induced current to send out the product information stored in the chip, or actively send a signal of a certain frequency to read After the information is read and decoded by the reader, it is sent to the central information system for relevant data processing.

　　Of course, some people will have a feeling after stopping to explain that radio frequency technology is very similar to barcodes, but radio frequency technology and barcodes are actually two different technologies, which have different scopes of application and sometimes overlap. The biggest difference between the two is: barcodes are "visual technology", the scanner works under the guidance of a human and can only receive barcodes within its field of view. In contrast, RFID does not require the target to be seen and can be read as long as it is within range of the receiver. The barcode itself has other drawbacks, too. If the label is scratched, soiled, or peeled off, the scanner cannot identify the target. Barcodes can only identify producers and products, but not specific commodities. The barcodes attached to all the same product packaging are the same, and it is impossible to identify which products expire first. The chip memory of the radio frequency tag provides the detailed information of the product: product name, origin, material, batch, production date, and product validity and other information.

　　Since ID RFID is a non-contact automatic identification technology, which is also one of its most important advantages, it can read labels through harsh environments where snow, fog, ice, paint, grime and barcodes cannot be used, and Reading is extremely fast, under 100ms in most cases. It automatically identifies target objects and obtains relevant data through radio frequency signals. The identification work does not require manual intervention and can work in various harsh environments. And because RFID technology can identify high-speed moving objects and identify multiple tags at the same time, the operation is fast and convenient. It is widely used in interactive business such as process tracking and maintenance tracking.

　　RFID is currently widely used in logistics and supply management, manufacturing and assembly, airline baggage handling, mail/express parcel handling, document tracking/library management, animal identification, sports timing, access control/electronic tickets, automatic road tolling, A cartoon and so on.

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