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Article

Ferroelectret Ultrasonic Transducers for Pulse-Echo Water Immersion

1
Instituto de Tecnologías Físicas y de la Información, CSIC, 28006 Madrid, Spain
2
Department of Electronics Engineering, Kaunas University of Technology, LT-51368 Kaunas, Lithuania
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(24), 8771; https://doi.org/10.3390/app10248771
Received: 10 November 2020 / Revised: 24 November 2020 / Accepted: 4 December 2020 / Published: 8 December 2020
(This article belongs to the Special Issue Ultrasonic Transducers and Related Apparatus and Applications)
Ferroelectrets are thin and porous polymeric films with a cellular microstructure, high porosity, permanent polarization and piezoelectric response. They have been used for different applications, where one of the most interesting ones is for the fabrication of air-coupled ultrasonic transducers. More recently they have been tested as water immersion transducers, showing a promising wide bandwidth but limited sensitivity along with other technical problems. This paper investigates ultrasonic transducers for water immersion and pulse-echo operation based on ferroelectret films. Two different ferroelectret foams with different resonant frequencies, acoustic impedances and cellular structures were tried. Flat and spherically focused prototypes (radius of curvature of 22 and 35 mm) were produced and tested. Finally, different materials and methods were tried to provide a protective surface coating. Acoustic field measurements for the focused transducers confirm the possibility to efficiently focus the ultrasonic beam by the proposed fabrication method, with focal spot size of 1.86 mm at −6 dB. Results show that in spite of the reduced sensitivity (about −115 dB), some of the tried ferroelectret films provide a very wide band response (−6 dB band from 0.29 to 2.7 MHz) and short pulse duration (2–3 us) that can be of interest for different applications. View Full-Text
Keywords: ferroelectret films; ultrasonic transducers; pulse-echo transducers; water immersion transducers; ultrasonic medical imaging; ultrasonic NDT ferroelectret films; ultrasonic transducers; pulse-echo transducers; water immersion transducers; ultrasonic medical imaging; ultrasonic NDT
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MDPI and ACS Style

Quirce, J.; Svilainis, L.; Camacho, J.; Gomez Alvarez-Arenas, T. Ferroelectret Ultrasonic Transducers for Pulse-Echo Water Immersion. Appl. Sci. 2020, 10, 8771. https://doi.org/10.3390/app10248771

AMA Style

Quirce J, Svilainis L, Camacho J, Gomez Alvarez-Arenas T. Ferroelectret Ultrasonic Transducers for Pulse-Echo Water Immersion. Applied Sciences. 2020; 10(24):8771. https://doi.org/10.3390/app10248771

Chicago/Turabian Style

Quirce, Julio, Linas Svilainis, Jorge Camacho, and Tomas Gomez Alvarez-Arenas. 2020. "Ferroelectret Ultrasonic Transducers for Pulse-Echo Water Immersion" Applied Sciences 10, no. 24: 8771. https://doi.org/10.3390/app10248771

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