Enhanced KLM Model for Single-Fibre Piezocomposite Transducers
- Resource Type
- Authors
- Sylvia Gebhardt; Nicole V. Ruiter; Michael Zapf; Holger Neubert; Martin Angerer
- Source
- 2020 IEEE International Ultrasonics Symposium (IUS).
- Subject
- 010302 applied physics
Physics
Acoustics
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Piezoelectricity
Vibration
Resonator
Transducer
Dimension (vector space)
Normal mode
Transmission line
0103 physical sciences
0210 nano-technology
Standard model (cryptography)
- Language
The requirements of our third generation 3D ultrasound computer tomography system (USCT) led to a transducer array design based on single-fibre piezocomposites. The used piezoelectric ceramic fibres exhibit a thickness to diameter ratio of 4/3. This ratio results in a proximity of the dominant axial and lateral vibration resonances. The standard Krimholtz-Leedom-Matthaei (KLM) model considers only one spatial dimension. This limits the validity of the modelled predictions for our application. By adding a coupled transmission line in series to the axial resonator, the standard model can be extended to take additional spatial dimensions into account. Using model parameters from literature resulted in a low model-to-measurement fit. To enhance the prediction accuracy, a brute-force optimisation over four model parameters was conducted. With the optimal parameter set, a fit of 90.3% could finally be achieved. The necessary model parameter changes were found reasonable for the piezocomposite design. With the presented model enhancement it is now possible to consider both dominant vibration modes of our transducers.