Properties of a Lens-focused Transducer Based on Piezoelectric Composites

doi:10.15541/jim20140601

Journal of Inorganic Materials ›› 2015, Vol. 30 ›› Issue (7): 745-750.DOI: 10.15541/jim20140601

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Properties of a Lens-focused Transducer Based on Piezoelectric Composites

HE Min¹, HAO Qi¹, WANG Ke-Xin¹, ZENG De-Ping¹, YE Fang-Wei², LI Fa-Qi¹, WANG Zhi-Biao¹, HE Hong-Ying³

(1. State Key Laboratory of Ultrasound Engineering in Medicine Co-Founded by Chongqing and the Ministry of Science and Technology, College of Biomedical Engineering, Chongqing Key Laboratory of Biomedical Engineering, Chongqing Medical University, Chongqing 400016, China; 2. National Engineering Research Center of Ultrasound Medicine, Chongqing 401121, China; 3. College of Materials Science and Engineering of Sichuan University, Chengdu, Sichuan 610064, China)

Received:2014-11-20 Revised:2015-03-06 Published:2015-07-20 Online:2015-06-25
About author:HE Min. E-mail:kathy1210@foxmail.com
Supported by:
National Natural Science Foundation of China (81127901, 81201102, 11274404);State Key Development Program for Basic Research of China (973 program, 2011CB707900);Science and Technology Project of Chongqing (2010BB5368)

Abstract

Abstract:

To broaden the bandwidth of focused transducer with suppressing the multimode coupling phenomenon, and improving the electro-acoustic conversion efficiency, 1-3 piezoelectric composites as the ultrasonic emission material was used to replace Pb-based lanthanum doped zirconate titanates ceramic. A new type of lens-focused transducer was designed and produced based on 1-3 piezoelectric composites. Through the comparative study of frequency characteristic, it is proved that the 1-3 piezoelectric composites lens-focused transducer can not only increase the bandwidth of the transducer which is 3.13 times of the one based on Pb-based lanthanum doped zirconate titanates, but also suppress the radial vibration obviously to obtain a single pure vibration modes. Besides, the electro-acoustic conversion efficiency of the former lens-focused transducer is 1.88 times of the latter one. These results provide a theoretical and experimental foundation for the realization of ultrasonic transducer of high efficiency on reliability and stability.

Key words: 1-3 piezoelectric composites, focused transducer, acoustic lens, electro-acoustic conversion

CLC Number:

TQ050

HE Min, HAO Qi, WANG Ke-Xin, ZENG De-Ping, YE Fang-Wei, LI Fa-Qi, WANG Zhi-Biao, HE Hong-Ying. Properties of a Lens-focused Transducer Based on Piezoelectric Composites[J]. Journal of Inorganic Materials, 2015, 30(7): 745-750.

Figures/Tables 8

Fig. 1 Schematic diagram of 1-3 piezoelectric composites

Fig. 2 Fabrication flow chart of piezoelectric composites

Fig. 3 Microscope figure of 1-3 piezoelectric composites

Fig. 4 Structure diagram (a) and photo (b) of lens-focused transducer

Fig. 5 Frequency-impedance and frequency-phase curves of PZT piezoceramics and 1-3 piezoelectric composites

Table 1 Electromechanical coupling coefficient of material

Material parameters	PZT piezoceramics	1-3 piezoelectric composites
k_t	0.48	0.64
k_p	0.58	0.33
k_t/k_p	0.83	1.94

Fig. 6 Frequency-impedance and frequency-phase curves of lens-focused transducer (a) PZT piezoceramics; (b) 1-3 piezoelectric composites

Fig. 7 Electric power-sound power (a) and electro-acoustic conversion efficiency (b) curves of lens-focused transducer

References 24

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Properties of a Lens-focused Transducer Based on Piezoelectric Composites

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