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Estimation of Acoustic Power Output from Electrical Impedance Measurements

1
Faculty of Information Technology and Bionics, Pázmány Péter Catholic University, 1083 Budapest, Hungary
2
Department of Engineering Science, Institute of Biomedical Engineering, University of Oxford, Oxford OX3 7DQ, UK
*
Author to whom correspondence should be addressed.
Acoustics 2020, 2(1), 37-50; https://doi.org/10.3390/acoustics2010004
Received: 19 November 2019 / Revised: 27 January 2020 / Accepted: 28 January 2020 / Published: 4 February 2020
A method is proposed for estimating the acoustic power output of ultrasound transducers using a two-port model with electrical impedance measurements made in three different propagation media. When evaluated for two high-intensity focused ultrasound transducers at centre frequencies between 0.50 and 3.19 MHz, the resulting power estimates exceeded acoustic estimates by 4.5–21.8%. The method was shown to be valid for drive levels producing up to 20 MPa in water and should therefore be appropriate for many HIFU (high-intensity focused ultrasound) applications, with the primary advantage of employing relatively low-cost, non-specialist materials and instrumentation. View Full-Text
Keywords: acoustic power output; transducer characterization; electrical impedance; KLM model; two-port acoustic power output; transducer characterization; electrical impedance; KLM model; two-port
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Csány, G.; Gray, M.D.; Gyöngy, M. Estimation of Acoustic Power Output from Electrical Impedance Measurements. Acoustics 2020, 2, 37-50.

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