Process Development And Characterization Of Piezoelectric Transducers On Flexible Substrates For High Frequency Ultrasound Applications
Loading...
Author(s)
Karahasanoglu, Batin
Advisor(s)
Editor(s)
Collections
Supplementary to:
Permanent Link
Abstract
Piezoelectric materials have a wide range of applications from vibration sensing, energy harvesting to medical imaging. Ceramic materials are most commonly used type of piezoelectric, but their high sintering temperature and rigidity are limiting factors for their use in some applications especially one that require conformal structures on flexible and non-planar surfaces. This thesis focuses on characterization and process development for a 0-3 composite piezoelectric material (PiezoPaintTM) to from transducers and transducer arrays on flexible substrates for high frequency ultrasound imaging and measurement applications. Several fabrication methods including screen printing, stencil printing are developed to form transducers on flexible substrates like polyimide with thickness and lateral dimensions in the 15-200µm range. These devices are formed at low temperatures (<140°C) and poling process conditions were optimized in terms of time and voltage levels. Piezoelectric property measurements indicate d33 coefficients higher than typical polymer films like PVDF and surface roughness levels suitable for high frequency operations. Ultrasound transducer performance of the devices characterized through pulse-echo and hydrophone measurements. The results indicate that they are suitable for medical imaging applications in the 5-15MHz range with broad bandwidth. Current work focuses on device optimization and characterization using suitable samples like heart tissue and optimizing process parameters for smaller scale and high frequency applications.
Sponsor
Date
2023-05-01
Extent
Resource Type
Text
Resource Subtype
Thesis