NDLI: Investigation of potassium niobate as an ultrasonic transducer material

Content Provider	IEEE Xplore Digital Library
Author	Kari, N.M. Ritter, T.A. Park, S.E. Shrout, T.R. Shung, K.K.
Copyright Year	2000
Description	Author affiliation: NIH Resource Center for Med. Ultrasonic Transducer Eng., Penn State Univ., University Park, PA, USA (Kari, N.M.)
Abstract	This paper investigates the use of single crystal potassium niobate (KNbO/sub 3/) as an ultrasonic transducer material. Crystallographic engineering allows the samples to be optimized for high coupling coefficients for the vibration modes of interest. The piezoelectric properties of KNbO/sub 3/ in both thickness and length extensional mode have been measured for two different crystallographic orientations. The measured high coupling coefficients (k/sub t/ =68% and k/sub 33/=75%) mid-range Q/sub m/(mechanical) of 40 and high longitudinal velocities of 8000 m/sec enable the use of KNbO/sub 3/ for high frequency transducers. A potential drawback is high measured values of electrical loss. In order to investigate losses at the frequencies of interest a curve-fitting program was used. The results show low losses above 1 MHz. A 10 Mhz transducer was fabricated using two optimally designed matching layers to match the high acoustic impedance with tissue. Modeling was performed both with the measured losses at 1 kHz and the low loss values obtained through curve fitting. The experimental pulse echo response indicates that the effect of losses on the transducer performance is minimal, indicating that losses are not a major factor. A broad bandwidth of 64% and insertion loss of 17 dB was obtained.
Starting Page	1065
Ending Page	1068
File Size	338649
Page Count	4
File Format	PDF
ISBN	0780363655
ISSN	10510117
DOI	10.1109/ULTSYM.2000.921508
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-10-22
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Niobium compounds Ultrasonic transducers Acoustic transducers Crystallography Ultrasonic variables measurement Frequency Acoustic measurements Loss measurement Curve fitting Crystalline materials
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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