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Detection of wood defects using low acoustic impedance-based PZT transducers

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Abstract

Early detection of common defects in wooden structures is an important factor to avoid costly maintenance and improve the life expectancy of structures. A novel qualitative technique has been developed and evaluated for detecting near-surface abnormalities and defects in wooden structures. The proposed setup consisted of a piezoelectric ceramic lead zirconate titanate transducer and an impedance evaluation board. This setup is cost-effective and can be easily employed over various wooden structures. The proposed setup was evaluated on a polymeric material with a debonding. The main experimental validations were conducted on wood specimens with unfilled carved cavities and also putty-filled holes. In addition, the setup was tested for the poor gluing in a wooden specimen. The measured impedance for each location was recorded and normalized to the reference baseline. The proposed setup could detect the cavities and putty-filled regions successfully. It also could detect the approximate geometry of defects. The glued and unglued regions were detected as well.

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Acknowledgments

We would like to express our gratitude to Prof. Yaping Dan (UM-SJTU JI), Prof. Yu Zhefeng (School of Aeronautics and Astronautics, SJTU) and Prof. Aili Zhang (School of Biomedical Engineering, SJTU), Mr. Rui Zhang (UM-SJTU JI), Mr. Baojun Ning (School of Aeronautics and Astronautics, SJTU) and Mr. Sun Bin (Micro-Nano Key Institute, SJTU) for their support and contribution on setting up and experimental issues.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Michigan – Shanghai Jiao Tong University Joint Institute, Shanghai, China

    Ali Mohammadabadi & Roberto Dugnani

  2. Department of Mechanical Engineering, University of Maryland, Baltimore County, MD, 21250, USA

    Ali Mohammadabadi

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  1. Ali Mohammadabadi
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  2. Roberto Dugnani
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Correspondence to Roberto Dugnani.

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Mohammadabadi, A., Dugnani, R. Detection of wood defects using low acoustic impedance-based PZT transducers. J Indian Acad Wood Sci 17, 107–113 (2020). https://doi.org/10.1007/s13196-020-00260-2

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  • DOI: https://doi.org/10.1007/s13196-020-00260-2

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