基于WSN的北美冬青鲜切枝冷链全过程监测系统

为了保证北美冬青鲜切枝冷链物流过程中的品质，提高冷链物流过程的可追溯性和透明度，以433MHz为发射频率，温湿度和气体环境为关键参数，设计了面向北美冬青鲜切枝冷链物流的无线实时监测系统。系统包括从传感器节点、主传感器节点和远程监测系统。从传感器节点集成了温湿度传感器、CO2传感器和乙烯传感器，主传感器节点用于建立和维护无线传感网络和汇集数据，远程监测系统用于远程实时监控。同时，对传感器节点的标定、准确性和功耗进行测试，并且将该系统应用于北美冬青冷链实地监测。结果表明，监测系统能够很好地应用于北美冬青存储和运输全过程，且能够稳定、准确地监测冷链环境温度、相对湿度、CO2和乙烯体积分数等关键参数的变化过程，有效反映了北美冬青鲜切枝的品质变化。

Monitoring System Based on WSN for Fresh Cut Branches of Ilex verticillata in the Whole Cold Chain

The paper designed a wireless real-time monitoring system with 433 transmission frequency for fresh cut branches of Ilex verticillata in cold chain logistics, which can monitor the temperature, relative humidity, CO2 and ethylene gas. The objective is to ensure and improve the quality, traceability and transparency for fresh cut branches of Ilex verticillata in cold chain logistics. The system includes master sensor node which is used to build and maintenance of wireless sensor network and data acquisition, slave sensor nodes which contain temperature, humidity, O2, CO2 and ethylene sensors and remote monitoring system for remote monitoring and controlling. At the same time, the sensor calibration, accuracy and power consumption are tested, and the system was applied to the North American holly cold chain monitoring. The results proved that the wireless real-time monitoring system can effective applied in cold chain logistics for fresh cut branches of Ilex verticillata, which was stable and accurate for monitoring the critical parameters and quality change for fresh cut branches of Ilex verticillata in cold chain logistics.