High frequency single element transducer based on pad-printed lead-free piezoelectric thick films

A transducer for medical imaging was fabricated using a pad-printing process to deposit a curved lead-free thick film (KNN-based) on an electroded backing (porous KNN). First, the electromechanical properties of the pad-printed thick film were measured. An effective thickness coupling factor of 34%...

Full description

Saved in:
Bibliographic Details
Published in2011 IEEE International Ultrasonics Symposium pp. 848 - 851
Main Authors Levassort, Franck, Gregoire, Jean-Marc, Lethiecq, Marc, Astafiev, Konstantin, Nielsen, Lise, Lou-Moeller, Rasmus, Wolny, Wanda. W.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.10.2011
Subjects
Acoustics
Electrodes
high frequency
Impedance
Lead
lead-free
pad-printing
piezoelectricity
Substrates
thick film
Thick films
transducer
Transducers
Online AccessGet full text

Cover

More Information
Summary:A transducer for medical imaging was fabricated using a pad-printing process to deposit a curved lead-free thick film (KNN-based) on an electroded backing (porous KNN). First, the electromechanical properties of the pad-printed thick film were measured. An effective thickness coupling factor of 34% (similar to those obtained with the same composition by a screen-printing process) was obtained. The transducer has a f-number of 1.3 and a focal distance around 5 mm. The center frequency is at 12 MHz and the -dB bandwidth is 93% and a high sensitivity is observed. For the first time, images of human skin in vivo were obtained using a lead-free film. They are compared to those obtained with a PZT-based transducer.
ISBN:9781457712531
1457712539
ISSN:1051-0117
DOI:10.1109/ULTSYM.2011.0207