An experimental acoustic cloak for generating virtual images

Hu, Wenlin; Fan, Yang; Ji, Peifeng; Jiang, Yang

doi:10.1063/1.4775408

Cited by 22 publications

(15 citation statements)

References 32 publications

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“…The good cloak effect was shown by the experimental results. Since then, more relative researches on carpet cloak for airbone sound have been reported [17][18][19]. Compared with carpet cloak for airbone sound, the underwater one has more important practical applications, but suffering from difficulty in impedance matching and microstructure design [20,21].…”

Section: Introductionmentioning

confidence: 99%

Quasi-isotropic underwater acoustic carpet cloak based on latticed pentamode metafluid

Sun

Han

et al. 2019

Applied Physics Letters

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In this work, we present a practical design of quasi isotropic underwater acoustic carpet cloak with pentamode microstructure. The quasi conformal transformation is not only used to obtain the required parameters, but also used to deform the retrieved regular pentamode material structure to the desired carpet, during which the effective parameters can be considered as not being affected too much. The nice and broadband cloak effect shows the success of the design. This work will contribute to the experimental demonstration of pentamode acoustic carpet cloak. Moreover, the technique in this work also can be used to design arbitrarily shaped devices with microstructures.

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Section: Introductionmentioning

confidence: 99%

Quasi-isotropic underwater acoustic carpet cloak based on latticed pentamode metafluid

Sun

Han

et al. 2019

Applied Physics Letters

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“…In 2011, Zhang, et al 5 made a 2D cylindrical acoustic cloak for underwater ultrasound based on transmission line approach. Hu, et al 6 fabricated the 2D rhombic acoustic cloak with perforated plates. Zigoneanu, et al 7 realized the three-dimensional broadband omnidirectional acoustic ground cloak based on their 2D model in air 8 .…”

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confidence: 99%

“…Since the properties of the four sections are the same, we can just calculate the section in the first quadrant. The interior and exterior boundaries in the first quadrant can be expressed as .Substitute equation(6) into equation(4), we can get the density and bulk modulus of the cloak. As mentioned above, the properties are functions of both and r. However, as shown inFigure 1(right), the cloak can be divided into N small sections, within each of which can be seen as constant, denoted as , 1,2,••• , .…”

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confidence: 99%

Two-dimensional acoustic cloaks of arbitrary shape with layered structure based on transformation acoustics

Vipperman

2014

Applied Physics Letters

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Acoustic metamaterials have attracted much attention in recent years. Acoustic cloaks, which make objects invisible to acoustic waves, are the most common use for acoustic metamaterials. In this paper, acoustic cloaks with arbitrary shapes are presented based on transformation acoustics. This method interprets the compression and dilation of space as appropriate properties of materials. The derived properties of the cloak with irregular shapes are highly inhomogeneous and anisotropic, much more complex than the annulus cloaks. The materials for this kind of cloak are impossible to find in nature, and difficult to fabricate with artificial materials. In order to overcome this difficulty, layered structure with isotropic materials is adopted to approximate the required properties of the cloak. Numerical simulations about the cloaks of arbitrary shape are performed to validate the design.

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“…For instance, Popa et al [44] and Zigoneanu et al [41] have demonstrated the effectiveness of ground cloaks experimentally in the two-and three-dimensional cases, respectively. An acoustic cloak comprised perforated plates for generating virtual images was validated by Hu et al [45]. Apart from the above-mentioned homogeneous cloaks, an annulus cloak constructed with a network of acoustic circuit elements [46], and a directional threedimensional cloak designed on the basis of the scattering cancellation technique [47] were also validated experimentally.…”

Section: Introductionmentioning

confidence: 99%

Non-singular acoustic cloak derived by the ray tracing method with rotationally symmetric transformations

Gao

2016

Proc. R. Soc. A.

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Recently, the ray tracing method has been used to derive the non-singular cylindrical invisibility cloaks for out-of-plane shear waves, which is impossible via the transformation method directly owing to the singular push-forward mapping. In this paper, the method is adopted to design a kind of non-singular acoustic cloak. Based on Hamilton's equations of motion, eikonal equation and pre-designed ray equations, we derive several constraint equations for bulk modulus and density tensor. On the premise that the perfect matching conditions are satisfied, a series of non-singular physical profiles can be obtained by arranging the singular terms reasonably. The physical profiles derived by the ray tracing method will degenerate to the transformation-based solutions when taking the transport equation into consideration. This illuminates the essence of the newly designed cloaks that they are actually the so-called eikonal cloaks that can accurately control the paths of energy flux but with small disturbance in energy distribution along the paths. The nearperfect invisible performance has been demonstrated by the numerical ray tracing results and the pressure distribution snapshots. Finally, a kind of reduced cloak is conceived, and the good invisible performance has been measured quantitatively by the normalized scattering width.

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An experimental acoustic cloak for generating virtual images

Cited by 22 publications

References 32 publications

Quasi-isotropic underwater acoustic carpet cloak based on latticed pentamode metafluid

Quasi-isotropic underwater acoustic carpet cloak based on latticed pentamode metafluid

Two-dimensional acoustic cloaks of arbitrary shape with layered structure based on transformation acoustics

Non-singular acoustic cloak derived by the ray tracing method with rotationally symmetric transformations

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