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Sensors 2017, 17(7), 1690; doi:10.3390/s17071690

Pinhole Zone Plate Lens for Ultrasound Focusing

Centro de Tecnologías Físicas, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
Departamento de Comunicaciones, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
Departamento de Ingeniería Electrónica, Universitat de València, Avd. de la Universitat s/n, 46100 Burjassot, Valencia, Spain
Author to whom correspondence should be addressed.
Received: 26 June 2017 / Revised: 14 July 2017 / Accepted: 20 July 2017 / Published: 22 July 2017
(This article belongs to the Special Issue Acoustic Wave Resonator-Based Sensors)
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The focusing capabilities of a pinhole zone plate lens are presented and compared with those of a conventional Fresnel zone plate lens. The focusing properties are examined both experimentally and numerically. The results confirm that a pinhole zone plate lens can be an alternative to a Fresnel lens. A smooth filtering effect is created in pinhole zone plate lenses, giving rise to a reduction of the side lobes around the principal focus associated with the conventional Fresnel zone plate lens. The manufacturing technique of the pinhole zone plate lens allows the designing and constructing of lenses for different focal lengths quickly and economically and without the need to drill new plates. View Full-Text
Keywords: ultrasonic lens; Fresnel lens; pinhole ultrasonic lens; Fresnel lens; pinhole

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Rubio, C.; Fuster, J.M.; Castiñeira-Ibáñez, S.; Uris, A.; Belmar, F.; Candelas, P. Pinhole Zone Plate Lens for Ultrasound Focusing. Sensors 2017, 17, 1690.

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