Focusing with two-dimensional angular-symmetric circular acoustic lenses

Kaya, Olgun Adem; Çiçek, Ahmet; Uluğ, Bülent

doi:10.1134/s1063771011030067

Cited by 8 publications

(2 citation statements)

References 32 publications

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“…Such induced gradient in the filling fraction, in turn, modifies the effective refractive index 22 and red-shifts the guided spectral range. 36 The results in Figs. 5 and 6 suggest that plausible wave transmission even at the most stringent conditions can be accomplished across the physically attainable smooth bends of the ASWs.…”

Section: Band Structures and Transmission Spectramentioning

confidence: 94%

Acoustic waveguiding by pliable conduits with axial cross sections as linear waveguides in two-dimensional sonic crystals

Çiçek

Kaya

Uluğ

2013

The Journal of the Acoustical Society of America

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Pliable conduits composed of periodically arranged concentric aluminum tori in air, with their axial cross sections acting as linear waveguides in two-dimensional sonic crystals, are numerically shown to guide acoustic waves in three dimensions in a flexible manner. Waveguide band structures are obtained by exploiting axial symmetry in a super-cell approach through two-dimensional finite-element simulations under the periodic boundary conditions. One isolated band having a bandwidth of 19.66% or 10.10% is observed for each guide, whose cross section is either in square or triangular geometry, respectively. Corresponding mode profiles indicate efficient guiding, as the acoustic energy is mainly concentrated in the hollow-core region of the guides. Transmittance spectra calculated through finite-element simulations are in agreement with the computed guiding bands. Transmittance along the waveguides with square and triangular axial cross sections around mid-band frequencies of their guiding bands varies slightly from -6.05 and -6.65 dB to -5.98 and -8.86 dB, respectively, as the guide length is increased from 10 to 200 periods. Efficient guiding across the smooth bends over circular arcs up to 90 deg is also demonstrated through three-dimensional finite-element method simulations.

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Section: Band Structures and Transmission Spectramentioning

confidence: 94%

Acoustic waveguiding by pliable conduits with axial cross sections as linear waveguides in two-dimensional sonic crystals

Çiçek

Kaya

Uluğ

2013

The Journal of the Acoustical Society of America

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“…The receiver is placed on the right side centre of the sample, and it consists of one grid point. Adopted material parameters are ρ aluminum = 2700 kg/m 3 , ρ air = 1.21 kg/m 3 for densities and c aluminum = 6325 m/s, c air = 334.5 m/s for longitudinal speeds of sound in the homogeneous media, respectively [9]. Thus the wavelength of the ultrasound λ in aluminum is 2.5 mm.…”

Section: Methodsmentioning

confidence: 99%

The Impacts of Structure Position and Size Change on Ultrasonic Transmission Properties

2015

2015 the 5th International Workshop on Computer Science and Engineering-Information Processing and Control Engineering

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Based on the finite differential time-domain (FDTD) method, two types of aluminum plate samples with one and two circular cavities are established. The ultrasonic transmission signal and acoustic pressure distribution for samples with different cavity positions (x) and diameters (d) are obtained through FDTD simulations. The results show that when x is between 6 wavelengths (15 mm) and 14 wavelengths (35 mm) of the ultrasound, the power of the transmitted ultrasonic signal increases dramatically for the two cavity diameters of d = 2λ and d = λ. Such an increase is especially large when the cavity is in the middle and the maximum relative change is about 260% when d = 2λ. However, the power does not change much with changing x and is close to the sample with no cavity when d = 0.5λ. It also shows that the transmitted power is weakened for the sample with two cavities due to the coupling effect between them. These results may have potential use in ultrasonic detection.

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Wavelength-scale gas-filled cuboid acoustic lens with diffraction limited focusing

2019

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Focusing with two-dimensional angular-symmetric circular acoustic lenses

Cited by 8 publications

References 32 publications

Acoustic waveguiding by pliable conduits with axial cross sections as linear waveguides in two-dimensional sonic crystals

Acoustic waveguiding by pliable conduits with axial cross sections as linear waveguides in two-dimensional sonic crystals

The Impacts of Structure Position and Size Change on Ultrasonic Transmission Properties

Wavelength-scale gas-filled cuboid acoustic lens with diffraction limited focusing

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