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http://dx.doi.org/10.7776/ASK.2007.26.2.080

Acoustic Properties of Ultrasonic Transducer Using Piezocomposites  

Lee, Sang-Wook (영남대학교 전자공학과)
Ryu, Jeong-Tag (대구대학교 전자공학부)
Nam, Hyo-Duk (영남대학교 전자정보공학부)
Kim, Yeon-Bo (대구대학교 전자공학부)
Publication Information
The Journal of the Acoustical Society of Korea / v.26, no.2, 2007 , pp. 80-86 More about this Journal
Abstract
We have investigated on the development of 2-2 type piezocomposites that have better piezoelectric activity and lower acoustic impedance than those of conventional piezoceramics. In this study, we have investigated the piezoelectric and acoustic properties of 2-2 type piezocomposites sensor which was fabricated using dice-and-fill technique for the different volume fraction of PZT. The specific acoustic impedance of 2-2 type piezocomposites decreased linearly when PZT volume fraction was decreased. The resonance characteristics measured by an impedance analyzer(HP4194A) were similar to the analysis of finite element method (FEM). The resonance characteristics and the electromechanical coupling factor were the best when the volume fraction PZT was 0.6. It also showed the highest result from the standpoint of sensitivity, bandwidth and ring-down property and so on at the same condition. The specific characteristics show that the 2-2 type piezocomposites turned out to be superior to the ultrasonic sensor composed by single phase PZT.
Keywords
2-2 type piezocomposites; Specific acoustic impedance; Electromechanical coupling factor; Piezoceramics; Finite element method;
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