Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/34882
Title: A dual frequency ultrasonic transducer based on BNBT-6/epoxy 1-3 composite
Authors: Wang, DY
Chan, HLW 
Keywords: Lead-free ceramics
1-3 composite
Dual frequency ultrasonic transducer
Issue Date: 2003
Publisher: Elsevier
Source: Materials science and engineering B, 2003, v. 99, no. 1-3, p. 147-150 How to cite?
Journal: Materials science and engineering B
Abstract: A lead-free piezoelectric ceramic, 0.94(Bi0.5Na0.5) TiO3–0.06BaTiO3 (BNBT-6), was used to fabricate 1-3 composite ultrasonic transducers. BNBT-6 ceramic has a high thickness electromechanical coupling coefficient kt of 0.46 and a low planar coupling coefficient kp (∼0.26). A 1-3 composite with 0.575 mm ceramic width and 0.225 mm epoxy gap was fabricated by a dice-and-fill technique. Resonance characteristics of the composite were measured as a function of sample thickness. Mode-coupling theory was applied to calculate the resonance frequencies of the ceramic rods inside the 1-3 composites. The changes in resonance frequencies with composite thickness showed reasonable agreement with the theoretical predictions. With the width to thickness ratio (L/H) of the ceramic rods close to 1.45, the thickness mode coupled to the lateral mode and the composite showed two strong resonance modes in the impedance spectrum. At this aspect ratio, the composite was constructed into a dual frequency ultrasonic transducer. The pulse-echo response, bandwidth and insertion loss of the transducer were measured. The good transducer performance indicated that the BNBT-6/epoxy 1-3 composite would be a promising lead-free material for medical imaging applications.
URI: http://hdl.handle.net/10397/34882
ISSN: 0921-5107
DOI: 10.1016/S0921-5107(02)00458-0
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

WEB OF SCIENCETM
Citations

14
Last Week
0
Last month
Citations as of Feb 20, 2017

Page view(s)

11
Last Week
1
Last month
Checked on Feb 19, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.