ABSTRACT
This chapter presents a low-frequency radio-frequency identification (LF-RFID) sensing system integrated with Internet of things (IoTs) to detect and characterize corrosion. The LF-RFID sensing system comprises of a tag and reader inductively linked with each other. Tag interacts with corroded metal through eddy currents and measure changes in corroded surface conductivity and permeability. Sensitivity and impedance of LF-RFID sensor varies with distance between the tag and the reader which is adjusted to find the optimum working range. The static and transient feature of the LF-RFID sensor signal is used to characterize corrosion at a low computational rate. The size of commercial low frequency tags is very small as compared to the structures in practice. So, IoTs are used to make a wireless sensor network of the proposed sensing system. Results showed an enhancement in sensitivity to corrosion characterization at the optimum distance between the tag and the reader. Using IoTs, several sensors are cascaded to make wireless sensor network and enable monitoring a wide structural area.
