AP2.3 - Wireless Food Monitoring System with High Efficient Long-range Battery-less Smart Sensor Tag

17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria
Applications 2 - Real-life Environments
W. Chung, X. Cao - Department of Electronic Engineering, Pukyong National University, Busan (South Korea)
360 - 361


This paper describes the design of a high efficient long-range battery-less smart sensor Tag using a relay resonator and its applications for meat freshness monitoring. The proposed smart sensor tag using a relay resonator, placed inside the sealed package to measure the emitted gas concentration, relative humidity, and environment temperature for evaluate the quality level of meat. The sensor module is designed using the excellent measurement accuracy sensors at ultra-low power consumption that the total power consumption is less than 1.3mW. This paper also presents a highly efficient RF energy harvester using a relay resonator which based on resonant coupled wireless power transfer system. An equivalent circuit is used to investigate the effect of relay resonator on harvested power, efficiency and transmission distance. As verified by the analysis and practical measurements, the proposed harvesting method is able to generate approximately 10 times higher power than the conventional energy harvesting methods. By using proposed energy harvesting method, the proposed sensor module can collect the sensing data during the meat spoilages without using any batteries at maximum distance 50 cm. The collected sensing data are analyzed to evaluate the freshness of meat packages.