9 March 2014 Development of a wireless nonlinear wave modulation spectroscopy (NWMS) sensor node for fatigue crack detection
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Fatigue crack is one of the main culprits for the failure of metallic structures. Recently, it has been shown that nonlinear wave modulation spectroscopy (NWMS) is effective in detecting nonlinear mechanisms produced by fatigue crack. In this study, an active wireless sensor node for fatigue crack detection is developed based on NWMS. Using PZT transducers attached to a target structure, ultrasonic waves at two distinctive frequencies are generated, and their modulation due to fatigue crack formation is detected using another PZT transducer. Furthermore, a reference-free NWMS algorithm is developed so that fatigue crack can be detected without relying on history data of the structure with minimal parameter adjustment by the end users. The algorithm is embedded into FPGA, and the diagnosis is transmitted to a base station using a commercial wireless communication system. The whole design of the sensor node is fulfilled in a low power working strategy. Finally, an experimental verification has been performed using aluminum plate specimens to show the feasibility of the developed active wireless NWMS sensor node.
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Peipei Liu, Peipei Liu, Suyoung Yang, Suyoung Yang, Hyung Jin Lim, Hyung Jin Lim, Hyung Chul Park, Hyung Chul Park, In Chang Ko, In Chang Ko, Hoon Sohn, Hoon Sohn, "Development of a wireless nonlinear wave modulation spectroscopy (NWMS) sensor node for fatigue crack detection", Proc. SPIE 9064, Health Monitoring of Structural and Biological Systems 2014, 906406 (9 March 2014); doi: 10.1117/12.2045747; https://doi.org/10.1117/12.2045747


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