Single Piezoelectric Transducer as Strain Sensor and Energy Harvester Using Time-multiplexing Operation
IEEE Transactions on Industrial Electronics
Institute of Electrical and Electronics Engineers (IEEE)
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This paper presents the implementation of a single piece of macro-fiber composite (MFC) piezoelectric transducer as a multifunctional device for both strain sensing and energy harvesting for the first time in the context of an energy harvesting powered wireless sensing system. The multifunction device is achieved via timemultiplexing operation for alternating dynamic strain sensing and energy harvesting functions at different time slots associated with different energy levels, that is, when there is insufficient energy harvested in the energy storage for powering the system, the MFC is used as an energy harvester for charging up the storage capacitor; otherwise, the harvested energy is used for powering the system and the MFC is used as a strain sensor for measuring dynamic structural strain. A circuit is designed and implemented to manage the single piece of MFC as the multifunctional device in a time-multiplexing manner, and the operation is validated by the experimental results. The dynamic strains measured by the MFC in the implemented system match a commercial strain sensor of extensometer by 95.5 to 99.99 %, and thus the studied method can be used for autonomous structural health monitoring of dynamic strain.
This work was supported in part by the Engineering and Physical Sciences Research Council, U.K., through the Projects SMARTERSmart Multifunction Architecture and Technology for Energy-Aware Wireless Sensors under Grant EP/K017950/1. All data are provided in full in the results section of this paper.
This is the author accepted manuscript. The final version is available from IEEE via the DOI in this record.
Published online 5 June 2017