Topic
Acoustic interferometer
About: Acoustic interferometer is a research topic. Over the lifetime, 1493 publications have been published within this topic receiving 19355 citations.
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TL;DR: In this paper, the authors proposed an efficient design route to realize directional excitation of the structure-induced surface waves for airborne sound, which consists of a periodically corrugated rigid plate combining with a pair of asymmetric narrow slits.
Abstract: We propose an efficient design route to realize directional excitation of the structure-induced surface waves for airborne sound. The whole system consists of a periodically corrugated rigid plate combining with a pair of asymmetric narrow slits. The directional excitation of the mimicked surface waves stems from the destructive interference between the evanescent waves emitted from the double slits. The directionality can be switched conveniently by tuning the external frequency. The theoretical prediction is validated well by simulations and experiments. Promising applications can be anticipated such as in designing compact devices for airborne sound.
17 citations
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17 citations
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TL;DR: In this paper, the authors demonstrate that by adding a modulation on the surface of a two-dimensional phononic crystal (PC), acoustic surface waves can be induced on the polygonal surface.
Abstract: We demonstrate that by adding a modulation on the surface of a two-dimensional phononic crystal (PC), acoustic surface waves can be induced on the surface. Taking advantage of the surface waves, the imaging quality of a PC lens, which utilizes the negative refraction of acoustic waves, can be greatly improved. It is shown by numerical simulation that for a point acoustic source, an image with a lateral size of 0.35λ is formed.
17 citations
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TL;DR: In this article, the authors present an experimental technique to separate and investigate the Schoch effect in ultrasonics by applying an acoustic barrier, based on acousto-optic Schlieren photography.
Abstract: The Schoch effect in ultrasonics, when sound is incident at the Rayleigh angle on a liquid-solid interface, consists of a forward beam displacement of the reflected beam, usually accompanied by a null strip in between the specular portion and the nonspecular reflected beam portion. It is a widely accepted idea that the effect is caused by reflected sound in combination with a sound field emitted by leaky Rayleigh waves. The current work presents an experimental technique to separate and investigate both fields separately by applying an acoustic barrier. The experiments are based on acousto-optic Schlieren photography.
17 citations