Working principle and performance of RFID technology in harsh environments
Radio frequency identification (RFID) technology belongs to the perception layer in the Internet of Things. The perception layer is the lowest layer in the Internet of Things architecture, which is mainly responsible for information collection and perception. It collects, converts and transmits information from the physical world to the Internet of Things platform through various sensors and perception devices. As an important information sensing technology, RFID automatically identifies target objects and obtains relevant data through wireless radio frequency signals without human intervention, and can work in various harsh environments. Therefore, RFID technology is a key component of the perception layer of the Internet of Things.
1.Specific application of radio frequency identification (RFID) technology in the perception layer of the Internet of Things
The specific application cases of radio frequency identification (RFID) technology in the perception layer of the Internet of Things include multiple fields, and it is widely used and important in the Internet of Things.
Logistics management: RFID technology has been widely used in logistics management. For example, in the Airport Aviation Logistics Park, Sinotrans Air Transport Development Company uses RFID equipment to quickly distribute goods, significantly improving the efficiency of logistics operations. In addition, RFID technology is also used to monitor and manage the transportation, warehousing, loading and unloading of goods in real time to ensure the efficiency and transparency of the logistics process.
Smart tool management: RFID technology can be used for smart tool management, which can automatically identify and track tools through the radio frequency identification system, thereby improving management efficiency and accuracy.
Smart medical consumables cabinet: In the medical field, RFID technology is applied to smart medical consumables cabinets, which can identify and track medical consumables through tags to ensure the rational use and inventory management of consumables.
Smart stores and unmanned retail cabinets: RFID technology is also used in smart stores and unmanned retail cabinets, which can identify the goods purchased by customers through RFID retail tags to achieve self-service checkout and inventory management.
Bus parking lot safety supervision system: RFID technology is also used in the safety supervision system of bus parking lots, combining the vehicle entrance and exit management system and the intelligent video surveillance system of the station to improve the safety and management efficiency of the parking lot.
Industrial Internet of Things and Intelligent Transportation Systems: In the Industrial Internet of Things and Intelligent Transportation Systems, RFID technology is used to solve read-write conflicts and data collection problems, and improve read-write efficiency and accuracy. For example, the "Internet Bicycle" routing protocol based on Delay Tolerant Network (DTN) is used to collect data in the sensor network of the public bicycle sharing system.
2.Interaction between the perception layer and other layers in the IoT architecture
In the IoT architecture, the interaction between the perception layer and other layers (such as the network layer and the application layer) is as follows:
The perception layer collects information from the real world, such as temperature, humidity, light, sound, location, video, etc., through various sensors and data acquisition devices. After the information is converted into a standard data format, it is processed by the embedded system and transmitted to the base station nodes and access gateways of the access layer through the wireless communication network, and finally reaches the user terminal. The network layer is located between the perception layer and the application layer, and is responsible for transmitting the data information collected by the perception layer to the application layer for analysis and management. The network layer mainly includes three parts: the aggregation network, the access network, and the bearer network. The aggregation network uses wireless communication technology (such as TPUNB, LoRa, ZigBee, Bluetooth, Wi-Fi, etc.) to realize the aggregation of range perception data; the access network uses 6LoWPAN and M2M architecture to realize the access of perception data from the aggregation network to the bearer network; the bearer network uses IPv6 and M2M technology to meet the needs of a large number of addresses and realize intelligent connection between machines and equipment.
The application layer is the top layer of the IoT architecture and is responsible for converting processed data into actual applications. The perception layer interacts with the platform layer through an interface and sends the data from the perception layer to the platform layer for processing. At the same time, the module also needs to process instructions from the application layer, convert the instructions into specific operation instructions and send them to the perception layer. The application layer mainly completes data management and data processing, and combines these data with industry applications. In the smart medical system construction project, the application layer collects, analyzes and processes data from various hospital scenarios to achieve mutual perception and linkage between IoT nodes and hospital equipment.
3.Working principle and performance of RFIDtechnology in harsh environments
The working principle and performance of RFID technology in harsh environments can be analyzed from multiple aspects.
The core of RFID technology lies in its non-contact identification method. When the industrial RFID tags enter the RF field of the reader, the antenna receives the RF signal emitted by the reader, generates an induced current, activates the chip in the tag, and thus realizes the reading of information. This non-contact identification enables the RFID system to work normally in harsh environments such as darkness, dust, and oil stains, and is not affected by natural factors such as light, dust, rain, and snow.
RFID systems have strong anti-interference capabilities. RFID harsh tag can still work properly even in the presence of cover or harsh environments (such as dust, oil stains, etc.). In addition, RFID harsh tag can operate in special environments such as high temperature, high humidity, and high electromagnetic interference, although their performance may be affected under these extreme conditions, resulting in recognition failure or instability.
RFID technology also has the ability to scan quickly and identify at long distances. It can identify multiple tags at the same time, greatly improving the efficiency of data collection, and can identify in places where direct line of sight cannot reach. This feature makes RFID perform well when used in industrial facilities for applications such as instrument identification.
In addition, rugged RFID tagsare usually made of metal foil, have a long service life, and have anti-magnetic, waterproof, high temperature resistance, and low mechanical wear and tear. These characteristics enable Rugged Rfid tags to work stably for a long time in harsh environments.
However, it should be noted that although RFID technology performs well in most harsh environments, its performance may be limited under certain extreme conditions, such as extremely high temperature or high humidity. Therefore, when choosing an application scenario for RFID technology, specific environmental conditions still need to be considered.
The working principle of RFID technology in harsh environments is mainly to achieve automatic identification and data collection through non-contact radio frequency signal transmission.
4.Advantages and Disadvantages of Radio Frequency Identification (RFID) Technology in the Perception Layer of the Internet of Things
The application of radio frequency identification (RFID) technology in the perception layer of the Internet of Things has significant advantages and disadvantages. The following is a detailed assessment of the advantages and limitations of RFID technology in the IoT perception layer:
a. Advantages
RFID technology is a contactless automatic identification technology that transmits and identifies information through radio frequency signals without physical contact, which makes it work efficiently in various environments.
RFID systems can quickly read tag information and can identify multiple tags at the same time, which is very useful for scenarios where a large number of items need to be processed quickly.
Rugged uhf RFID tags can store a large amount of data, including product information, location information, etc., which facilitates the tracking and management of items.
The data access of RFID tags is usually password protected and highly secure, making them suitable for applications that require high security.
RFID hard tags are small in size and light in weight, can be embedded or attached to various objects, and have a long service life.
RFID systems can achieve long-distance reading, which is very beneficial for application scenarios that need to cover a large area.
b. Disadvantages
Although the cost of RFID Hard Tag is gradually decreasing, the overall cost of RFID systems is still high, including the investment in hardware equipment and software systems, which is a considerable expense for small and medium-sized enterprises.
During batch identification, RFID systems may have identification errors, especially when tags are dense or the environment is complex.
RFID technology has standardization issues among different vendors and applications, which can lead to compatibility issues and interoperability issues.
Although RFID harsh tags are password protected, there is still a risk of being cracked, especially in application scenarios with extremely high security requirements.
Although the power consumption of the RFID tag itself is low, in some application scenarios, such as sensor networks that need to work for a long time, the overall power consumption of the RFID system still needs to be considered.
RFID technology has significant advantages in the perception layer of the Internet of Things, such as non-contact identification, fast reading, large data storage, high security, small size, long life and long reading distance. However, its high system cost, recognition errors, standardization issues, security flaws, and power consumption issues are also challenges that need to be paid attention to and solved.
5.In addition to RFID, what other key technologies are there in the perception layer of the Internet of Things?
In addition to RFID, there are many other key technologies in the perception layer of the Internet of Things. These technologies mainly include:
Sensor technology: Sensors are the core technology of the perception layer, which are used to perceive physical, chemical, biological and other information, and convert these information into electrical signals and transmit them to the network layer. Sensor technology uses sensors and multi-hop self-organizing sensor networks to collaboratively perceive and collect information about perceived objects in the network coverage area.
Barcode recognition technology: Barcodes include one-dimensional codes and two-dimensional codes. It is an economical and practical automatic recognition technology with the advantages of fast input speed, high reliability, large amount of information collection, and flexibility and practicality. It is widely used in various fields.
EPC coding: The EPC code (electronic product code) has a very large coding capacity, which can meet the requirement of "one object, one code" in the Internet of Things, and can be read at a long distance. Its goal is to establish a global information exchange language through a unified and standardized coding system.
GPS technology: GPS technology is used to locate and track the location of objects and is an important part of the perception layer.
Self-organizing networks and sensor networks: These technologies are used to achieve self-organization and collaboration between perception layer devices to improve the efficiency of information collection and transmission.
Wireless communication technology: such as Bluetooth, infrared, ZigBee, TPUNB, LoRa, etc., for wireless data transmission.
Camera: used for image acquisition and monitoring, it is one of the important tools of the perception layer.