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Challenges and needs
The so-called cold chain logistics refers to a systematic project that temperature-sensitive products are always in a pre-defined low temperature environment during production, storage, transportation, and sales to ensure the quality of goods and reduce logistics losses. It is generally divided into cold storage ( Frozen) processing, refrigerated (frozen) storage, refrigerated (frozen) transportation and distribution, and refrigerated (frozen) sales, among which refrigerated transportation and distribution are the weak links of cold chain logistics. Due to the large changes in the environment and the limitations of technology and cost factors, the risk of quality accidents caused by changes in the temperature of items during transportation and distribution is greater than that of other links. Moreover, under normal circumstances, the closed type of the transportation and distribution process will often cause difficulties in the subsequent identification of the cause of the accident, that is, when and where did the temperature of the item exceed the limit? Is it due to sudden environmental factors or continuous failure of the refrigeration (frozen) system? The solution of these problems requires a technology that can continuously record the temperature of items and conveniently store and send this temperature data to the background management system.
With the rapid development of active RFID technology and applications, the industry has gradually realized the important application of temperature sensing systems based on active RFID technology in cold chain logistics: active RFID tag integration, real-time temperature data acquisition through temperature sensors, Then it is sent to the connected RFID tag for storage, and the data obtained by the RFID tag is read out when it enters the reading range of the reader for use. Through this method, it is possible to realize early warning when the temperature changes during the transportation/distribution process, or to record the temperature changes in the process, so as to help identify the quality changes that may be caused by temperature changes and the specific time of occurrence, and help Responsibility determination for quality accidents. For example, in the transportation of medical blood, the temperature should be strictly controlled at 4°C (±0.5°C). If traditional temperature monitoring methods are used, only the end-to-end node temperature can be monitored, but even if the node temperature is normal, it cannot be guaranteed. The temperature during transportation is always normal, and using RFID technology, it is possible to understand whether the blood temperature changes during the transportation and the quality changes that may be caused by it. The large gap between my country’s cold chain system and developed countries means that this market has considerable potential. With the full opening of the logistics industry, investment in the logistics industry will further increase, and the scale of the cold chain logistics market will increase accordingly, which will bring opportunities for RFID applications. For now, there are no technical barriers to the application of RFID cold chain logistics, and cost is still the main bottleneck. At present, RFID applications are concentrated in the areas of sensitive or valuable commodities, such as organs for transplantation, blood for medical use, bone marrow, vaccines, medicines, and precious wines, precious flowers, and high-value seafood. In addition to the application in sensitive and valuable areas, the longer the transportation distance and the more turnover of cold chain systems, the application demand for RFID is also increasing accordingly. In ordinary cold chain applications, although the cost of RFID is relatively high, compared with the self-developed “black box” temperature monitoring system (such as the cargo tracking and temperature tracking system currently used by McDonald’s), RFID still has large-scale applications Cost advantage. With the continuous advancement of technology leading to lower costs, cold chain logistics RFID applications will become popular and have broad application prospects.
application solution
In response to the aforementioned issues, Shanghai Xiupai Electronic Technology Co., Ltd. recently launched a cold chain temperature monitoring system based on active RFID technology. Through advanced active RFID technology, in the logistics management and production process management of fresh foods and medicines that require suitable temperature monitoring and management to ensure the quality, the temperature data of the collected items are continuously recorded in the active electronic tags. The freshness and quality of the products are managed in a meticulous and real-time manner.
The working mode of the system is very simple. The temperature data collected by the temperature sensor is regularly written into the RFID tag. When the RFID tag enters the signal coverage area of the remote reader, the temperature data in the RFID chip is uploaded to the remote reader and handed over to the remote reader. Back-end system processing. This system can combine GPRS/CDMA and other technologies to transmit temperature monitoring data to the background in real time to achieve the effect of real-time monitoring of the temperature changes of the target item; it can also read all temperature data at one time after the transported item reaches the target location to generate temperature changes Chart to complete the supervision of temperature changes in the supply chain. The following figure shows a schematic diagram of temperature changes during a complete transportation process:
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Due to various possible external factors and the failure of refrigeration (frozen) equipment during transportation, the temperature of the item usually changes. The storage space in the active tag can be large enough to place a sufficient number of temperature records (in ideal conditions, it can be Simulated by mathematical tools as a continuous curve). If the temperature change exceeds a preset range, such as 20°C～30°C, obviously, there is a record in the middle of the curve that is significantly lower than 20°C. At this time, you can query the corresponding location and external environment based on this time to facilitate Explore the reasons for the corresponding temperature changes.
Under normal circumstances, a time clock is set in the active tag, and the time will be checked with the reader each time it is activated. The built-in security algorithm ensures that only authorized users can read the data in the tag and ensure that all stored temperature and The time record cannot be illegally modified.
In large-scale cold chain logistics applications, the real-time nature of information collection and transmission is increasingly valued by the industry. Certain extremely valuable and important items such as vaccines, special plasma, emergency medicines, etc. must be comprehensive in real time. Monitoring, so that any signs of damage can be effectively obtained as soon as they appear, and play an early warning role for related emergency mechanisms. An incomplete cold chain logistics temperature monitoring mode is shown in the figure below:
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First, the temperature tag will be loaded on the target item (box), and after the shipment has started, it will continue to record the temperature of the environment where the item is located. Generally, there are two application modes. One is to upload temperature data at one time in each logistics link, and the logistics management platform integrates all the uploaded data to monitor the quality of items in each link; the other is to set up a real-time transmission mechanism on the transport vehicle/ship. For example, GPRS, etc., the logistics management platform can continuously monitor the target items. The only difference between the two modes is that the latter mode, the real-time mode, can be used to rescue some valuables, and not just like the former mode can only identify whether the item is damaged. Of course, the active label is to identify a certain packaging box (cabinet), and different packaging units in the same container can be monitored by installing multiple active labels.
As the chief supplier of domestic active RFID products, Shanghai Supai provides high-quality temperature sensor tags that have undergone a large number of field tests and case verifications. At present, the temperature label provided by our company has the following characteristics:
1. The data storage capacity is large, and the maximum user space can be expanded to 256KB;
2. Reusable, low cost of use, no manual intervention, no need to separate the items;
3. The communication distance is long. It can communicate with a base station reader in a wide range of 80 meters, and it can also maintain a communication distance of 30 meters with a handheld reader;
4. Built-in high-energy lithium battery power supply, and adopts micro-power design, long service life (5 years);
5. The label is small in size and easy to install and use.
Program features
1. Large flow: extremely high anti-collision performance, adopting multiple anti-collision schemes, supporting simultaneous reading of more than 200 tags;
2. It supports high-speed mobile reading, and the moving speed of the identification card can reach more than 200 km/h.
3. High reliability, working temperature -40℃~85℃, waterproof and shockproof.
4. High anti-interference: There are no special requirements for various interference sources on site, and the installation is convenient and simple.
5. There is no need to apply and pay for the ISM microwave frequency band that is open worldwide.
6. Ultra-low power consumption: safer and healthier for the human body.
7. It can quickly grasp the temperature conditions during transportation, which is the most important in freshness management.
8. Promote the improvement of freshness management in the distribution process (improve shipping methods, select logistics routes).
9. If necessary, it can be expanded to a cold chain monitoring center data platform established by an enterprise or alliance covering the entire cold chain process.
10. Promote the safety of fresh food to consumers and establish a brand image. Provide consumers with “rest assured” services and establish a brand image; provide temperature data records, enhance core competitiveness, and meet higher-level “green food consumption” needs.
11. Meet the requirements of food safety supervision. Food safety and quality control HACCP requirements: According to the requirements of the HACCP system, in addition to inspecting the shelf life, outer packaging, and appearance of the food when receiving raw materials, the internal temperature of the food and the continuity of the temperature during transportation must be strictly inspected.
12. The temperature index can be set dynamically, which is convenient to use.
product description
1. Active proximity card SP-TST-100
The main technical performance is as follows:
Recognition distance: up to 80 meters (with SP-RGS-300, in the air)
Working frequency band: 2.4-2.48G
Receiving sensitivity: -80 dbm ～ -90 dbm
Storage space: standard 97 bytes, expandable
Expected battery life: 6 years, automatic alarm when battery power is too low
Power-down storage period: more than 10 years
ID number: 64 bit
Working temperature: -40℃ ～ +80℃
Storage temperature: -60℃ ～ +85℃
Anti-electromagnetic interference: 10V/m 0.1～1000MHz AM electromagnetic wave
Vibration: 10～2000Hz 15g three axes
Free fall: 1500mm concrete floor, twice on each side
Temperature sensitivity: 0.5℃
2. Reader (card reader) SP-RFS-300 series
The main technical performance is as follows:
Recognition speed: 100 tags/sec (ID number only)
Anti-collision processing: 200 tags read at the same time
Recognition distance: up to 80 meters (with SP-TGS series tags, in the air)
Working frequency band: 2.4-2.48G
Output power: ≤3 dBm (adjustable by software)
Microwave communication error detection: CRC16 cyclic redundancy check
Antenna polarization: directional/omnidirectional
Standards/Certifications: CE; FCC; ISO9001
Power supply: 6～12V DC (MAX 30mA)
Communication interface: RS232/485/Wigan Baud rate: 4800～115200
Working temperature: -40℃ ～ +80℃
Storage temperature: -60℃ ～ +80℃
Anti-electromagnetic interference: 10V/m 0.1～1000MHz AM electromagnetic wave
Reliability: MTBF ≥ 70000 hours
3. Handheld reader SP-RCF-100 series
The main technical performance is as follows:
Recognition speed: 100 tags/sec (ID number only)
Anti-collision processing: 200 tags read at the same time
Recognition distance: up to 30 meters (with SP-TGS series tags, in the air)
Working frequency band: 2.4－2.48G
Output power: ≤3 dBm (software adjustable)
Microwave communication error detection: CRC16 cyclic redundancy check
Antenna polarization: circular polarization
Standards/Certifications: CE; FCC; ISO9001
Power supply: PDA power supply
Communication interface: CF Baud rate: 19200
Working temperature: -40℃ ～ +80℃
Storage temperature: -60℃ ～ +80℃
Anti-electromagnetic interference: 10V/m 0.1～1000MHz AM electromagnetic wave
Reliability: MTBF ≥ 70000 hours
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