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RFID technology and barcode technology are both an automatic identification technology in the era of the Internet of Things. They both label objects for identification, which is equivalent to an ID card. However, there are very big differences in specific technical principles and industry applications. The following is an analysis of RFID and barcode technologies from the perspectives of technical principles, characteristics, and industry applications.
We are all familiar with barcodes, and we often see them in our daily lives, such as products purchased in supermarkets, books, etc. One-dimensional barcodes, during checkout, sales staff will use barcode scanners to scan them. Two-dimensional barcodes are also familiar to us. For example, the current smart devices can read two-dimensional codes to realize information recognition, which is very common in WeChat and other applications. RFID technology is now gradually appearing in our lives. For example, some products in large supermarkets are now affixed with RFID electronic tags, mainly cosmetics, clothes, etc., and some high-end brands of wine and agricultural products also use RFID technology for anti-counterfeiting and traceability. .
Principles of RFID and Barcode Technology
RFIDBarcodes and barcodes are both an automatic identification technology, which automatically collects and recognizes data, and automatically transmits it to a computer or database, providing the computer with an effective means of fast and accurate data collection and input.
RFID is the abbreviation of Radio Frequency Identification. The Chinese name is radio frequency identification. It is a wireless communication technology that uses radio signals to identify specific targets and read and write related data without requiring mechanical or optical contact between the identification system and specific targets. Data is stored in an electronic data carrying device, where the power supply and data transmission are based on magnetic or electromagnetic fields.
A bar code is a group of bars and empty symbols arranged according to a certain coding rule to represent information composed of certain characters, numbers and symbols. It is mainly divided into one-dimensional barcode and two-digit barcode. One-dimensional barcode is a binary code composed of wide and narrow lines and spaces arranged in parallel. Two-dimensional bar code is composed of matrix code and point code, and is coded in two-dimensional space. The bar code system is an automatic identification system composed of bar code symbol design, production and scanning.
Technical characteristics of RFID and barcode
Barcodes are mainly one-dimensional barcodes and two-dimensional barcodes. The technical characteristics of barcodes mainly have the following characteristics: simplicity, fast information collection, high reliability, flexibility and practicality, great freedom, and low cost. Barcode technology has low cost and is widely used in daily commodities and goods, and can be seen everywhere. The following is a description of these characteristics:
(1) Simple. Barcode symbols are easy to make, and the scanning operation is simple and easy.
(2) The speed of information collection is fast. The input speed of ordinary computer keyboard is 200 characters/minute, and the speed of inputting information using barcode scanning is 20 times that of keyboard input.
(3) The amount of information collected is large. Using barcode scanning, you can collect information of dozens of characters in turn, and you can increase the character density by selecting barcodes of different symbologies, which doubles the amount of information collected.
(4) Strong reliability. The keyboard input data has a bit error rate of one in three percent. Using optical character recognition technology, the bit error rate is about one in ten thousand. However, with the barcode scanning and input method, the error rate is only one part per million, and the first reading rate can reach more than 98%.
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(5) Flexible and use. The bar code symbol can be used alone as a means of identification, or it can be combined with related equipment to form an identification system to realize automatic identification, and it can also be linked with other control equipment to realize automatic management of the entire system. At the same time, manual keyboard input can also be realized when there is no automatic identification device.
(6) Large degree of freedom. The degree of freedom of the relative position of the recognition device and the barcode label is much greater than that of optical character recognition (OCR).
(7) The equipment has a simple structure and low cost. The bar code symbol recognition equipment has a simple structure and is easy to operate without special training. Compared with other automation technologies, the cost of popularizing and applying barcode technology is lower.
However, barcodes are relatively easy to wear, and the amount of data is small, and they are only valid for one or one type of commodity. The same commodity has the same barcode, which has certain limitations in many application fields.
The advantage of RFID technology is that it is not limited to line-of-sight, electronic tags also have read and write capabilities, carry a large amount of data, are difficult to forge and have relatively high intelligence. RFID technology has the following advantages:
(1) It is non-contact, so no manual intervention is required to complete the identification work, and it can be automated.
(2) The amount of data is large, and the target identity information and operating status other than the identification information can be transmitted as required.
(3) The information processing speed is fast.
(4) The confidentiality is high, and the data is hardly copied or modified without permission.
(5) The recognition distance is long.
(6) It has strong environmental adaptability, strong anti-interference ability, and can be used all-weather.
(7) A system can meet multi-purpose requirements, and can realize multi-target recognition and moving target recognition.
(8) The system has high reliability and convenient operation.
Application of RFID and barcode
The task of automatic identification is to provide information about individuals, objects and other identified objects. It can be said that both barcode and RFID are a language, and information is transmitted in the related process. Barcode cost is the lowest among all automatic identification technologies, and it is suitable for applications that require a large amount of data and do not need to be changed, such as the packaging of goods.
In recent years, RFID technology has been rapidly popularized and applied in various fields, mainly in warehousing and logistics, supply chain management, product traceability, food safety, production, material management, etc., and gradually entered the homes of ordinary people. RFID technology is important for all It is not remote and mysterious to people. RFID technology has unparalleled advantages of other technologies, and the technology has been quite mature. With the development of large-scale integrated circuits and the continuous growth of production scale, as well as the RFID market With the increase in demand, RFID has a very broad and beautiful application prospect.
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