Passive focusing techniques for piezoelectric air-coupled ultrasonic transducers

Ultrasonics
Tomás E Gómez Álvarez-ArenasCarlos Fritsch

Abstract

This paper proposes a novel passive focusing system for Air-Coupled Ultrasonic (ACU) piezoelectric transducers which is inspired by the Newtonian-Cassegrain (NC) telescope concept. It consist of a primary spherical mirror with an output hole and a flat secondary mirror, normal to the propagation axis, that is the transducer surface itself. The device is modeled and acoustic field is calculated showing a collimated beam with a symmetrical focus. A prototype according to this design is built and tested with an ACU piezoelectric transducer with center frequency at 400kHz, high-sensitivity, wideband and 25mm diameter flat aperture. The acoustic field is measured and compared with calculations. The presented prototype exhibit a 1.5mm focus width and a collimated beam up to 15mm off the output hole. In addition, the performance of this novel design is compared, both theoretically and experimentally, with two techniques used before for electrostatic transducers: the Fresnel Zone Plate - FZP and the off-axis parabolic or spherical mirror. The proposed NC arrangement has a coaxial design, which eases the transducers positioning and use in many applications, and is less bulky than off-axis mirrors. Unlike in off-axis mirrors, it is now p...Continue Reading

References

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Citations

Aug 6, 2016·Applied Physics Letters·Łukasz AmbrozińskiMatthew O'Donnell
Jul 20, 2016·Sensors·Tomas Gómez Álvarez-ArenasJose Javier Peguero-Pina
Dec 25, 2017·Journal of Biomedical Optics·Mitchell A KirbyMatthew O'Donnell
Dec 6, 2017·Sensors·José Miguel FusterConstanza Rubio
Dec 20, 2019·Biomedical Optics Express·Zi JinZhongping Chen

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