Fabrication of ultrasonic transducers with KNbO3 piezoelectric single crystal for detecting harmonic signals

被引：8

作者：

Adachi, H

Wakabayashi, K

Nishio, M

Ogawa, H

Kamakura, T

机构：

[1] Olympus Opt Co LTD, Hachioji, Tokyo 1928507, Japan

[2] Univ Electrocommun, Chofu, Tokyo 1928585, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS | 2001年 / 40卷 / 9B期

关键词：

second harmonics; third harmonics; separately arranged ultrasonic transducer; KNbO3; figure-of merit;

D O I：

10.1143/JJAP.40.5698

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

An ultrasonic transducer with a circular aperture has been designed and fabricated for the development of a harmonic imaging system with high sensitivity. The transducer consists of two piezoelectric elements; one is made from Pb(Zr, Ti)O-3 (PZT) ceramics for transmitting a finite-amplitude ultrasonic pulse, and the other is made from a KNbO3 (KN) piezoelectric singled crystal for receiving second harmonic signals generated in a nonlinear medium. They are arranged coaxially. Using this transducer, acoustic characteristics were measured and the observation of sponge phantom images was performed. Compared with other transducers with PZT and PbTiO3 (PT) ceramics, we have confirmed that higher sensitivity and stronger correlation between the sensitivity and figure-of-merit can be obtained. Additionally, the third harmonic detection has been demonstrated.

引用

页码：5698 / 5702

页数：5