Wireless Power Supply and Trouble Shooting for All-in-one Packaged Sensor Nodes Applicable to Infrastructure Monitoring

摘要

Online monitoring of infrastructures attracts great interests in recent years because of the increasing of nature disasters and thernaging of bridges, high-ways, buildings, etc. To ensure enough long lifetime (> 10 years) and low maintanence cost of the sensorrnnodes when deployed to wild field environments, an all-in-one ceramic package with stand-alone power source and wirelessrncommunication is under developing without external physical interconnections. This paper reports the development andrnevaluation of a wireless power transmission module for power backup and rescure when built-in solar cell cannot supplyrnsufficient energy. The results revealed that efficiency of the wireless power transmission, as high as 70%, was achieved when thernthickness of the ceramic package was 3 mm. Thanks to the impedance matching circuit, a 100 F lithium-ion capacitor can bernfully-charged within a few minutes. Moreover, a hybird RFID chip was introduced as a data-recorder for trouble shooting, whichrnis technically important for practical applications of above all-in-one sensor nodes for infrastructure monitoring.