Results 11 to 20 of about 15,272 (279)
A Lamb wave lens for acoustic microscopy [PDF]
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 1992 In a conventional scanning acoustic microscope the excited leaky modes contribute significantly to the high contrast obtained in the images. However, all such modes exist simultaneously, and the interpretation of the images is not straightforward, especially in layered media.
Atalar, A., Koymen H., Degertekin F.L.
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Lens Geometries for Quantitative Acoustic Microscopy [PDF]
, 1995 The purpose of the first Lemons-Quate acoustic microscope(1) was to image the surfaces of materials or biological cells with a high resolution. Unfortunately, competition with the optical microscope was only partially successful due to the high degree of absorption in the liquid-coupling medium at high frequencies.
Atalar, Abdullah +3 more
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An Acoustic Metamaterial Lens for Acoustic Point-to-Point Communication in Air [PDF]
Acoustical Physics, 2019 Acoustic metamaterials have become a novel and effective way to control sound waves and design acoustic devices. In this study, we design a 3D acoustic metamaterial lens (AML) to achieve point-to-point acoustic communication in air: any acoustic source (i.e. a speaker) in air enclosed by such an AML can produce an acoustic image where the acoustic wave
Sun, Fei +4 more
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Design of Fresnel Lens-Type Multi-Trapping Acoustic Tweezers
Sensors, 2016 In this paper, acoustic tweezers which use beam forming performed by a Fresnel zone plate are proposed. The performance has been demonstrated by finite element analysis, including the acoustic intensity, acoustic pressure, acoustic potential energy ...
You-Lin Tu +2 more
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Negative refraction imaging of acoustic metamaterial lens in the supersonic range
AIP Advances, 2014 Acoustic metamaterials with negative refraction index is the most promising method to overcome the diffraction limit of acoustic imaging to achieve ultrahigh resolution.
Jianning Han +3 more
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A new directional acoustic lens: V-groove lens [PDF]
1993 Proceedings IEEE Ultrasonics Symposium, 1993 A new directional acoustic lens is introduced. The geometry is very similar to the line-focus lens except the lens cavity, which is shaped as a groove with flat-bottom V cross section. The slanted planar edges of the groove are inclined in order to generate waves incident on the object surface at a critical angle.
Bozkurt, Ayhan +3 more
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Wavelength-scale gas-filled cuboid acoustic lens with diffraction limited focusing
Results in Physics, 2019 Per the laws of geometrical optics, a plane-parallel medium does not possess focusing properties. However, in this paper, we demonstrate for the first time that an acoustic cuboid particle filled with CO2 is able to focus sound despite its flat surface ...
Constanza Rubio +4 more
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Development of an Estimation Instrument of Acoustic Lens Properties for Medical Ultrasound Transducers. [PDF]
J Healthc Eng, 2017 In medical ultrasound transducers, the transmission mode (pass-through) approach has been used to estimate the characteristics of the acoustic lens. However, it is difficult to measure the acoustic lens properties with high precision because of human ...
Choi H, Jeong JJ, Kim J.
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Operator Please: Field Recording Practices Through The Lens Of Agential Realism Authors [PDF]
, 2023 The past decade has seen the proliferation of inexpensive long-duration field recording technologies made available to creative practitioners, researchers and amateurs alike. Without the need for continuous attendance of equipment, such technologies have
Budel, J.
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A Review of UltraHigh Frequency Ultrasonic Transducers
Frontiers in Materials, 2022 The ultrahigh-frequency (UHF) ultrasonic transducers are active in various fields, including nondestructive evaluation in the semiconductor industry, microscopic biological organization imaging in biomedicine, particle manipulation, and so on.
Jun Chen +8 more
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