Estimation of Acoustic Power Output from Electrical Impedance Measurements

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...

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Bibliographic Details
Published in:Acoustics (Basel, Switzerland) Switzerland), 2020-03, Vol.2 (1), p.37-50
Main Authors: Csány, Gergely, Gray, Michael, Gyöngy, Miklós
Format: Article
Language:English
Subjects:
acoustic power output
electrical impedance
klm model
transducer characterization
two-port
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Summary: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.
ISSN:2624-599X
2624-599X
DOI:10.3390/acoustics2010004