Dissimilar trend of nonlinearity in ultrasound transducers and systems at resonance and non-resonance frequencies

Ghasemi, Negareh, Zare, Firuz, Davari, Pooya, Vilathgamuwa, Mahinda, Ghosh, Arindam, Langton, Christian and Weber, Peter (2017) Dissimilar trend of nonlinearity in ultrasound transducers and systems at resonance and non-resonance frequencies. Ultrasonics, 74 21-29. doi:10.1016/j.ultras.2016.09.023


Author Ghasemi, Negareh
Zare, Firuz
Davari, Pooya
Vilathgamuwa, Mahinda
Ghosh, Arindam
Langton, Christian
Weber, Peter
Title Dissimilar trend of nonlinearity in ultrasound transducers and systems at resonance and non-resonance frequencies
Journal name Ultrasonics   Check publisher's open access policy
ISSN 0041-624X
1874-9968
Publication date 2017-02-01
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.ultras.2016.09.023
Open Access Status Not yet assessed
Volume 74
Start page 21
End page 29
Total pages 9
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Abstract Several factors can affect performance of an ultrasound system such as quality of excitation signal and ultrasound transducer behaviour. Nonlinearity of piezoelectric ultrasound transducers is a key determinant in designing a proper driving power supply. Although, the nonlinearity of piezoelectric transducer impedance has been discussed in different literatures, the trend of the nonlinearity at different frequencies with respect to excitation voltage variations has not been clearly investigated in practice. In this paper, to demonstrate how the nonlinearity behaves, a sandwich piezoceramic transducer was excited at different frequencies. Different excitation signals were generated using a linear power amplifier and a multilevel converter within a range of 30–200 V. Empirical relation was developed to express the resistance of the piezoelectric transducer as a nonlinear function of both excitation voltage and resonance frequency. The impedance measurements revealed that at higher voltage ranges, the piezoelectric transducer can be easily saturated. Also, it was shown that for the developed ultrasound system composed of two transducers (one transmitter and one receiver), the output voltage measured across receiver is a function of a voltage across the resistor in the RLC branches and is related to the resonance frequencies of the ultrasound transducer.
Keyword High power ultrasound transducer
Nonlinear behaviour
Power electronic converters
Ultrasound system excitation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Information Technology and Electrical Engineering Publications
 
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