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Open AccessArticle

Broadband and High Sensitive Time-of-Flight Diffraction Ultrasonic Transducers Based on PMNT/Epoxy 1–3 Piezoelectric Composite

1
Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, University of Chinese Academy of Sciences, 215 Chengbei Road, Jiading, Shanghai 201800, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Academic Editor: Gerhard Lindner
Sensors 2015, 15(3), 6807-6817; https://doi.org/10.3390/s150306807
Received: 4 January 2015 / Revised: 9 March 2015 / Accepted: 18 March 2015 / Published: 19 March 2015
(This article belongs to the Special Issue Acoustic Waveguide Sensors)
5–6 MHz PMNT/epoxy 1–3 composites were prepared by a modified dice-and-fill method. They exhibit excellent properties for ultrasonic transducer applications, such as ultrahigh thickness electromechanical coupling coefficient kt (85.7%), large piezoelectric coefficient d33 (1209 pC/N), and relatively low acoustic impedance Z (1.82 × 107 kg/(m2·s)). Besides, two types of Time-of-Flight Diffraction (TOFD) ultrasonic transducers have been designed, fabricated, and characterized, which have different matching layer schemes with the acoustic impedance of 4.8 and 5.7 × 106 kg/(m2·s), respectively. In the detection on a backwall of 12.7 mm polystyrene, the former exhibits higher detectivity, the relative pulse-echo sensitivity and −6 dB relative bandwidth are −21.93 dB and 102.7%, respectively, while the later exhibits broader bandwidth, the relative pulse-echo sensitivity and −6 dB relative bandwidth are −24.08 dB and 117.3%, respectively. These TOFD ultrasonic transducers based on PMNT/epoxy 1–3 composite exhibit considerably improved performance over the commercial PZT/epoxy 1–3 composite TOFD ultrasonic transducer. View Full-Text
Keywords: time-of-flight diffraction; ultrasonic transducer; PMNT; 1–3 piezoelectric composite time-of-flight diffraction; ultrasonic transducer; PMNT; 1–3 piezoelectric composite
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MDPI and ACS Style

Liu, D.; Yue, Q.; Deng, J.; Lin, D.; Li, X.; Di, W.; Wang, X.; Zhao, X.; Luo, H. Broadband and High Sensitive Time-of-Flight Diffraction Ultrasonic Transducers Based on PMNT/Epoxy 1–3 Piezoelectric Composite. Sensors 2015, 15, 6807-6817.

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