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Article

Directional Ultrasound Source for Solid Materials Inspection: Diffraction Management in a Metallic Phononic Crystal

1
Physics Department, Universitat Politècnica de Catalunya, Rambla Sant Nebridi 22, 08222 Terrassa, Spain
2
Instituto de Investigación Para la Gestión Integrada de Zonas Costeras, Universitat Politècnica de València, Paranimf 1, Grao de Gandia, 46730 València, Spain
3
Electronic Engineering Department, Universitat Politècnica de Catalunya, Rambla Sant Nebridi 22, 08222 Terrassa, Spain
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(21), 6148; https://doi.org/10.3390/s20216148
Received: 12 September 2020 / Revised: 22 October 2020 / Accepted: 26 October 2020 / Published: 29 October 2020
(This article belongs to the Special Issue Modeling, Development and Applications of Novel Ultrasound Sensors)
In this work, we numerically investigate the diffraction management of longitudinal elastic waves propagating in a two-dimensional metallic phononic crystal. We demonstrate that this structure acts as an “ultrasonic lens”, providing self-collimation or focusing effect at a certain distance from the crystal output. We implement this directional propagation in the design of a coupling device capable to control the directivity or focusing of ultrasonic waves propagation inside a target object. These effects are robust over a broad frequency band and are preserved in the propagation through a coupling gel between the “ultrasonic lens” and the solid target. These results may find interesting industrial and medical applications, where the localization of the ultrasonic waves may be required at certain positions embedded in the object under study. An application example for non-destructive testing with improved results, after using the ultrasonic lens, is discussed as a proof of concept for the novelty and applicability of our numerical simulation study. View Full-Text
Keywords: phononic crystals; self-collimation; ultrasonic lens; acoustic lens; ultrasonic wave diffraction; NDT phononic crystals; self-collimation; ultrasonic lens; acoustic lens; ultrasonic wave diffraction; NDT
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MDPI and ACS Style

Selim, H.; Picó, R.; Trull, J.; Prieto, M.D.; Cojocaru, C. Directional Ultrasound Source for Solid Materials Inspection: Diffraction Management in a Metallic Phononic Crystal. Sensors 2020, 20, 6148. https://doi.org/10.3390/s20216148

AMA Style

Selim H, Picó R, Trull J, Prieto MD, Cojocaru C. Directional Ultrasound Source for Solid Materials Inspection: Diffraction Management in a Metallic Phononic Crystal. Sensors. 2020; 20(21):6148. https://doi.org/10.3390/s20216148

Chicago/Turabian Style

Selim, Hossam; Picó, Rubén; Trull, Jose; Prieto, Miguel D.; Cojocaru, Crina. 2020. "Directional Ultrasound Source for Solid Materials Inspection: Diffraction Management in a Metallic Phononic Crystal" Sensors 20, no. 21: 6148. https://doi.org/10.3390/s20216148

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