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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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124 citations
TL;DR: In this article, the authors investigate tunable acoustic absorption enabled by the coherent control of input waves, and they show that complete absorption of incident waves impinging on the metamaterial can be achieved for either symmetrical or anti-symmetrical inputs in the forward and backward directions.
Abstract: We investigate tunable acoustic absorption enabled by the coherent control of input waves. It relies on coherent perfect absorption originally proposed in optics. By designing appropriate acoustic metamaterial structures with resonating effective bulk modulus or density, we show that complete absorption of incident waves impinging on the metamaterial can be achieved for either symmetrical or anti-symmetrical inputs in the forward and backward directions. By adjusting the relative phase between the two incident beams, absorption can be tuned effectively from unity to zero, making coherent control useful in applications like acoustic modulators, noise controllers, transducers, and switches.
123 citations
TL;DR: In this paper, an extension of the ultrasonic spectropy technique was used to determine dispersion of longitudinal waves in a solid at frequencies ranging from 2.2 to 7.6 MHz.
Abstract: The ultrasonic spectroscopy (broadband pulse) technique was applied to simultaneously measure phase velocity and attenuation coefficient of shear waves in a solid at frequencies ranging from 2.2 to 7.6 MHz. This technique is an extension of the ultrasonic spectropy technique currently used in determining dispersion of longitudinal waves.
121 citations
TL;DR: Martinez-Sala et al. as discussed by the authors used the plane-wave method in order to get the band structure of waves propagating in an infinite periodic system and employed, for the first time for acoustic waves, the transfer matrix method to find the transmission coefficient of waves along a system with a finite thickness.
Abstract: We study acoustic waves propagating in two-dimensional (2D) systems consisting of steel cylinders surrounded by air. We use the plane-wave method in order to get the band structure of waves propagating in an infinite periodic system. In addition, we employed, for the first time for acoustic waves, the transfer matrix method in order to find the transmission coefficient of waves propagating along a system with a finite thickness. Both methods are in good agreement with each other and their results agree with recent measurements in a similar system (R. Martinez-Sala et al., Nature, 378 (1995) 241). We also find the optimum conditions for the appearance of spectral gaps.
121 citations
TL;DR: Proportional velocity of pressure and sound in rocks by pulse transmission methods, determining time delay by means of frequency counter as discussed by the authors was used to determine the time delay of a pulse transmission.
Abstract: Proportional velocity of pressure and sound in rocks by pulse transmission methods, determining time delay by means of frequency counter
120 citations