Broad band single crystal transducer for contrast agent harmonic imaging

A broadband single element transducer was constructed from single crystal PMN-PT and tested to determine the feasibility of using this material for simultaneous subharmonic and second harmonic imaging. The transducer consisted of a 1-3 PMN-PT/epoxy composite with two quarter wave matching layers and...

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Bibliographic Details
Published inIEEE Symposium on Ultrasonics, 2003 Vol. 1; pp. 778 - 781 Vol.1
Main Authors Hackenberger, W., Jiang, X., Rehrig, P., Xuecang Geng, Winder, A., Forsberg, F.
Format Conference Proceeding
LanguageEnglish
Published IEEE 2003
Subjects
Acoustic imaging
Bandwidth
Crystals
Educational institutions
Frequency
High-resolution imaging
Piezoelectric transducers
Testing
Ultrasonic imaging
Ultrasonic transducers
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Summary:A broadband single element transducer was constructed from single crystal PMN-PT and tested to determine the feasibility of using this material for simultaneous subharmonic and second harmonic imaging. The transducer consisted of a 1-3 PMN-PT/epoxy composite with two quarter wave matching layers and a backing. The transducer face was spherically curved to yield a 50 mm focal point. The transducer had a center frequency of 5.2MHz and -6 dB bandwidth over 120% ranging from 2.08 MHz to 8.32 MHz, but the response decayed very slowly outside the -6 dB band so that useable bandwidth was estimated to be on the order of 200%. Subharmonic and second harmonic responses will be tested by driving the transducer with a 3.5 MHz 64-cycle tone burst and recording the impedance spectra of harmonics generated by Optison contrast agent dispersed in water. These tests are currently in progress.
ISBN:9780780379220
0780379225
DOI:10.1109/ULTSYM.2003.1293516