DocumentCode :
3233731
Title :
A study of 1–3 pseudo-random pillar piezocomposites for ultrasound transducers
Author :
Yang, Hao-Chung ; Cannata, Jonathan ; Williams, Jay ; Shung, K. Kirk
Author_Institution :
Dept. of Biomed. Eng., Univ. of Southern California, Los Angeles, CA, USA
fYear :
2011
fDate :
18-21 Oct. 2011
Firstpage :
1743
Lastpage :
1746
Abstract :
The goal of our research is to develop a new diced 1-3 piezocomposite geometry to reduce pulse-echo ring down and acoustic cross-talk between high frequency ultrasonic array elements. Two PZT-5H based 1-3 composites (10 and 15 MHz) with different pillar geometries (square (SQ), 45° triangle (TR), and pseudo-random (PR)) were fabricated and then made into single element ultrasound transducers. The measured pulse-echo waveforms and their envelopes indicate that the PR composites had the shortest -20 dB pulse length and strongest sensitivity among all the composites. Using these composites, 15 MHz array sub-apertures with a 0.95 λ pitch were fabricated to measure the acoustic cross-talk between array elements. The combined electrical and acoustical crosstalk between the nearest array elements of the PR array sub-apertures (-32 dB @ 15 MHz) was 6 dB and 2 dB lower than that of the SQ and the TR array sub-apertures, respectively. These results demonstrate that the 1-3 piezocomposite with the pseudo-random pillars may be a good choice for fabricating enhanced high frequency linear array ultrasound transducers; especially when mechanical dicing is used.
Keywords :
acoustic pulses; composite materials; echo; lead compounds; piezoelectric materials; piezoelectric transducers; ultrasonic transducer arrays; 1-3 pseudorandom pillar piezocomposite; PZT; PZT-5H based 1-3 composites; acoustic cross-talk; acoustical crosstalk; array subaperture; diced 1-3 piezocomposite geometry; electrical crosstalk; frequency 10 MHz; frequency 15 MHz; high frequency linear array ultrasound transducers; high frequency ultrasonic array elements; mechanical dicing; pillar geometry; pulse length; pulse-echo ring down reduction; pulse-echo waveform; single element ultrasound transducer; Acoustics; Arrays; Ceramics; Crosstalk; Geometry; Resonant frequency; Transducers; Cross-Talk; Lateral Interference; Piezocomposite; Pillar; Pseudo-Random; Square; Triangle;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Ultrasonics Symposium (IUS), 2011 IEEE International
Conference_Location :
Orlando, FL
ISSN :
1948-5719
Print_ISBN :
978-1-4577-1253-1
Type :
conf
DOI :
10.1109/ULTSYM.2011.0435
Filename :
6293605
Link To Document :
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