scholarly journals KNN/BNT composite lead-free films for high-frequency ultrasonic transducer applications

2011 ◽  
Vol 58 (1) ◽  
pp. 249-254 ◽  
Author(s):  
Sien Ting Lau ◽  
Hong Fen Ji ◽  
Xiang Li ◽  
Wei Ren ◽  
Qifa Zhou ◽  
...  
Keyword(s):  
High Frequency ◽  
Ultrasonic Transducer ◽  
Lead Free ◽  
Free Films

scholarly journals Lead-free KNLNT piezoelectric ceramics for high-frequency ultrasonic transducer application

Ultrasonics ◽  
2009 ◽  
Vol 49 (3) ◽  
pp. 395-398 ◽  
Author(s):  
D.W. Wu ◽  
R.M. Chen ◽  
Q.F. Zhou ◽  
K.K. Shung ◽  
D.M. Lin ◽  
...  
Keyword(s):  
High Frequency ◽  
Ultrasonic Transducer ◽  
Piezoelectric Ceramics ◽  
Lead Free ◽  
Transducer Application

High-frequency ultrasonic transducer fabricated with lead-free piezoelectric single crystal

2010 ◽  
Vol 57 (11) ◽  
pp. 2601-2604 ◽  
Author(s):  
Yan Chen ◽  
Xiang Ping Jiang ◽  
Hao Su Luo ◽  
Ji Yan Dai ◽  
H L W Chan
Keyword(s):  
Single Crystal ◽  
High Frequency ◽  
Ultrasonic Transducer ◽  
Lead Free

scholarly journals Fabrication and Characterization of High-Frequency Ultrasound Transducers Based on Lead-Free BNT-BT Tape-Casting Thick Film

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 3166 ◽  
Author(s):  
Junshan Zhang ◽  
Wei Ren ◽  
Yantao Liu ◽  
Xiaoqing Wu ◽  
Chunlong Fei ◽  
...  
Keyword(s):  
Thick Film ◽  
High Frequency ◽  
Electromechanical Coupling ◽  
Ultrasonic Transducer ◽  
Tape Casting ◽  
Lead Free ◽  
Center Frequency ◽  
Electromechanical Coupling Coefficient ◽  
High Frequency Ultrasound ◽  
Casting Method

A lead-free 0.94(Na0.5Bi0.5) TiO3-0.06 BaTiO3 (BNT-BT) thick film, with a thickness of 60 μm, has been fabricated using a tape-casting method. The longitudinal piezoelectric constant, clamped dielectric permittivity constant, remnant polarization and coercive field of the BNT-BT thick film were measured to be 150 pC/N, 1928, 13.6 μC/cm2, and 33.6 kV/cm, respectively. The electromechanical coupling coefficient kt was calculated to be 0.55 according to the measured electrical impedance spectrum. A high-frequency plane ultrasound transducer was successfully fabricated using a BNT-BT thick film. The performance of the transducer was characterized and evaluated by the pulse-echo testing and wire phantom imaging operations. The BNT-BT thick film transducer exhibits a center frequency of 34 MHz, a −6 dB bandwidth of 26%, an axial resolution of 77 μm and a lateral resolution of 484 μm. The results suggest that lead-free BNT-BT thick film fabricated by tape-casting method is a promising lead-free candidate for high-frequency ultrasonic transducer applications.

Design and fabrication of high frequency ultrasonic transducer based on lead-free Mn-doped (K0.44Na0.56)NbO3 single crystal

2017 ◽  
Vol 267 ◽  
pp. 182-186 ◽  
Author(s):  
Fangyuan Fan ◽  
Xiangyong Zhao ◽  
Feifei Wang ◽  
Qingwen Yue ◽  
Huifang Zhou ◽  
...  
Keyword(s):  
Single Crystal ◽  
High Frequency ◽  
Ultrasonic Transducer ◽  
Lead Free ◽  
Mn Doped

High-frequency ultrasonic transducer based on lead-free BSZT piezoceramics

Ultrasonics ◽  
2011 ◽  
Vol 51 (7) ◽  
pp. 811-814 ◽  
Author(s):  
S.T.F. Lee ◽  
K.H. Lam ◽  
X.M. Zhang ◽  
H.L.W. Chan
Keyword(s):  
High Frequency ◽  
Ultrasonic Transducer ◽  
Lead Free

Lead-free BNT composite film for high-frequency broadband ultrasonic transducer applications

2013 ◽  
Vol 60 (7) ◽  
pp. 1533-1537 ◽  
Author(s):  
Xingwei Yan ◽  
Hongfen Ji ◽  
Kwok Ho Lam ◽  
Ruimin Chen ◽  
Fan Zheng ◽  
...  
Keyword(s):  
Composite Film ◽  
High Frequency ◽  
Ultrasonic Transducer ◽  
Lead Free

Modeling of a high frequency ultrasonic transducer using periodic structures

2007 ◽  
Author(s):  
P. Maréchal ◽  
L. Haumesser ◽  
G. Feuillard ◽  
L.P. Tran-Huu-Hue ◽  
J. Holc ◽  
...  
Keyword(s):  
High Frequency ◽  
Periodic Structures ◽  
Ultrasonic Transducer

Design and Experiment of Capacitive Micromachined Ultrasonic Transducer Array for High-Frequency Underwater Imaging

2020 ◽  
Vol 13 ◽  
Author(s):  
Yuanyu Yu ◽  
Jiujiang Wang ◽  
Xin Liu ◽  
Sio Hang Pun ◽  
Weibao Qiu ◽  
...  
Keyword(s):  
Ultrasound Imaging ◽  
High Frequency ◽  
Ultrasonic Transducer ◽  
Center Frequency ◽  
Design Parameters ◽  
Underwater Imaging ◽  
Release Process ◽  
Steel Wires ◽  
Capacitive Micromachined Ultrasonic Transducer ◽  
Frequency Ultrasound

Background:: Ultrasound is widely used in the applications of underwater imaging. Capacitive micromachined ultrasonic transducer (CMUT) is a promising candidate to the traditional piezoelectric ultrasonic transducer. In underwater ultrasound imaging, better resolutions can be achieved with a higher frequency ultrasound. Therefore, a CMUT array for high-frequency ultrasound imaging is proposed in this work. Methods:: Analytical methods are used to calculate the center frequency in water and the pull-in voltage for determining the operating point of CMUT. Finite element method model was developed to finalize the design parameters. The CMUT array was fabricated with a five-mask sacrificial release process. Results:: The CMUT array owned an immersed center frequency of 2.6 MHz with a 6 dB fractional bandwidth of 123 %. The pull-in voltage of the CMUT array was 85 V. An underwater imaging experiment was carried out with the target of three steel wires. Conclusion:: In this study, we have developed CMUT for high-frequency underwater imaging. The experiment showed that the CMUT can detect the steel wires with the diameter of 100 μm and the axial resolution was 0.582 mm, which is close to one wavelength of ultrasound in 2.6 MHz.

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