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Acoustic analysis of ultrasonic air-borne transducer with concave structure

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Abstract

This paper introduces an ultrasonic transducer with a concave curved structure. The transducer is based on a concave piezoelectric film on a silicone support with an air cavity. Specifically, an air cavity exists between the piezoelectric film and the support in the shape of a curved cuboid, providing space for the film to vibrate. We build a theoretical model of a concave piezoelectric transducer. To validate the model, we demonstrate a concave piezoelectric transducer and measure the ultrasound pressure field using an acoustic imaging camera. Two types of experiments are conducted by supplying a sinusoidal input voltage with a frequency sweep and a voltage sweep. The experimental results share similarity with the theoretical results. In addition, we conduct a parametric study to analyze the characteristics of the transducer. Interestingly, we find that the radius of curvature and axial length primarily contribute to ultrasound pressure.

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Acknowledgements

The authors would like to thank Gyeong Min Lee for his help with drawing schematics. This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) under Grant 2022M3C1A3098746.

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  1. School of Electrical Engineering, Korea University, Anam-ro, Seoul, 02841, Republic of Korea

    Chae Gyu Lim & Youngsu Cha

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Correspondence to Youngsu Cha.

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Lim, C.G., Cha, Y. Acoustic analysis of ultrasonic air-borne transducer with concave structure. Intel Serv Robotics 17, 479–488 (2024). https://doi.org/10.1007/s11370-024-00538-1

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