Abstract
Online monitoring of infrastructures attracts great interests in recent years because of the increasing of nature disasters and the aging of bridges, high-ways, buildings, etc. In road infrastructure monitoring system (RIMS) project, to ensure enough long lifetime, i.e. > 10 years, and low maintenance cost of the sensor nodes when deployed to wild field environments for infrastructure monitoring, an all-in-one ceramic package with stand-alone power source and wireless communication is under developing without any external physical interconnections. This paper reports the development and evaluation of a wireless power transmission module for power backup and rescue when built-in solar cell or other power source cannot supply sufficient energy. The results clearly revealed that efficiency of the wireless power transmission, as high as 73.2%, was achieved when the thickness of the ceramic package was 3 mm. Thanks to the impedance matching circuit, a 100 F lithium-ion capacitor (LIC) can be fully-charged within a few minutes by using above module. Moreover, a hybrid RFID chip was introduced as a data-recorder for trouble shooting, which is technically important for practical applications of above all-in-one sensor nodes for infrastructure monitoring.
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