How diffraction limits ultrasonic screening in phononic plate composed of a periodic array of resonant slits

Aliyasin Elayouch; Mahmoud Addouche; Philippe Lasaygues; Younes Achaoui; Morvan Ouisse; Abdelkrim Khelif

doi:10.1016/j.crhy.2016.02.006

How diffraction limits ultrasonic screening in phononic plate composed of a periodic array of resonant slits
[Comment la diffraction limite l'opacité ultrasonore d'une plaque phononique composée d'un réseau périodique de fentes résonantes]

Aliyasin Elayouch ¹ ; Mahmoud Addouche ¹ ; Philippe Lasaygues ² ; Younes Achaoui ² ; Morvan Ouisse ¹ ; Abdelkrim Khelif ¹

¹ Institut FEMTO-ST, Université de Franche-Comté, CNRS, 15B avenue des Montboucons, 25030 Besançon cedex, France
² Laboratoire de mécanique et d'acoustique, UPR CNRS 7051, 31, chemin Joseph-Aiguier, 13402 Marseille cedex 20, France

Comptes Rendus. Physique, Volume 17 (2016) no. 5, pp. 518-523.

Résumé
Abstract

Nous étudions expérimentalement le rôle joué par la diffraction dans le phénomène d'isolation acoustique que présente une plaque phononique perforée périodiquement par des fentes sub-longueur d'onde et plongée dans l'eau. Nous avons effectué des mesures de transmission dans le domaine ultrasonore pour toutes les directions de propagation dans le but de vérifier l'omnidirectionalité de l'isolation acoustique. Alors qu'une fente se comporte comme un résonateur de Fabry–Pérot dans le domaine de fréquence considéré, le couplage des fentes voisines produit une bande fréquentielle d'atténuation centrée sur la fréquence de résonance et qui est quasiment indépendante de l'angle d'incidence. Au-delà d'un angle d'incidence de 45 degrés, cependant, nous observons l'apparition d'un rayonnement diffracté qui limite l'atténuation ultrasonore. Nous montrons que ce rayonnement indésirable provient de la diffraction associée au réseau de fentes.

We explore experimentally the role played by diffraction in the phenomenon of acoustic shielding provided by a plate that is periodically perforated with subwavelength slits and immersed in water. We carried out ultrasonic transmission measurements for all directions of propagation in order to check the omnidirectionality of acoustic shielding. While a single slit acts as a Fabry–Perot resonator in the frequency range of interest, the coupling between adjacent slits provides an attenuation frequency band centered around the resonant frequency that is mostly independent of the angle of incidence. Beyond the incident angle of 45 degrees, however, we observe the appearance of scattered radiation that limits the attenuation of ultrasound. This spurious scattering is shown to arise from diffraction by the grating of slits.

Publié le : 2016-03-02

DOI : 10.1016/j.crhy.2016.02.006

Keywords: Fabry–Perot acoustic resonator, Acoustic screening, Diffraction, Acoustic metamaterials
Mot clés : Résonateur acoustique de Fabry–Perot, Opacité acoustique, Diffraction, Métamatériaux acoustiques

Affiliations des auteurs :

Aliyasin Elayouch ¹ ; Mahmoud Addouche ¹ ; Philippe Lasaygues ² ; Younes Achaoui ² ; Morvan Ouisse ¹ ; Abdelkrim Khelif ¹

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     author = {Aliyasin Elayouch and Mahmoud Addouche and Philippe Lasaygues and Younes Achaoui and Morvan Ouisse and Abdelkrim Khelif},
     title = {How diffraction limits ultrasonic screening in phononic plate composed of a periodic array of resonant slits},
     journal = {Comptes Rendus. Physique},
     pages = {518--523},
     publisher = {Elsevier},
     volume = {17},
     number = {5},
     year = {2016},
     doi = {10.1016/j.crhy.2016.02.006},
     language = {en},
}

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Aliyasin Elayouch; Mahmoud Addouche; Philippe Lasaygues; Younes Achaoui; Morvan Ouisse; Abdelkrim Khelif. How diffraction limits ultrasonic screening in phononic plate composed of a periodic array of resonant slits. Comptes Rendus. Physique, Volume 17 (2016) no. 5, pp. 518-523. doi : 10.1016/j.crhy.2016.02.006. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2016.02.006/

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