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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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Proceedings ArticleDOI
18 Sep 2005
TL;DR: In this paper, the Rayleigh-like and shear waves on a 4" LiNbO3(YX)/Silicon wafer operating at 1 GHz were compared to the state of the art.
Abstract: Previous work has shown the possibility to transfer thin layers of oriented single crystal LiNbO3 onto silicon. Predictions and measurements of the Rayleigh-like and shear waves on a 4” LiNbO3(YX)/Silicon wafer operating at 1 GHz already have been presented and compared to the state of the art. Considering theoretical predictions, one can expect a factor of 2 for the coupling and reflection coefficients when exploiting the shear mode at 2 GHz. Comparing our new experimental results with theoretical predictions assuming the substrate conductive yields an improved agreement between theory and measurements. These new results at 2 GHz (measured coupling equal to 12.5% and 15% for the theoretical and experimental reflection coefficient) clearly prove the interest of the method.
Journal ArticleDOI
TL;DR: In this paper, an automated system for measuring the velocity, phase, and amplitude of ultrasonic waves in solids in the frequency range 1-20 MHz in CAMAC standard is described.
Abstract: An automated system for measuring the velocity, phase, and amplitude of ultrasonic waves in solids in the frequency range 1–20 MHz in CAMAC standard is described. The measurement errors fall within the limits 0.5% for the absolute velocity of acoustic waves, 0.2° for the phase, and 0.5% for the amplitude.
01 Jan 1991
TL;DR: A finite element Galerkin formulation was employed to study the optimum attenuation and reflection characteristics of acoustic waves propagating in two-dimensional straight ducts with extended reacting absorbing walls without a mean flow as discussed by the authors.
Abstract: A finite element Galerkin formulation was employed to study the optimum attenuation and reflection characteristics of acoustic waves propagating in tw0 dimensional straight ducts with extended reacting absorbing walls without a mean flow. The reflection and transmission of acoustic energy at the entrance and the exit of the duct were determined by coupling the finite element solutions in the absorbing portion of the duct to the eigenfunctions of an infinite, uniform, hard wall duct. In the frequency range where the duct height and acoustic wave length are nearly equal, power attenuation contours were examined to determine conditions for minimizing acoustic transmission through the duct. The extended reacting liners were found to significantly minimize the reflective characteristics of the duct rather than to increase absorption in the liner. Thus, extended reacting wall liner properties can be theoretically chosen to yield large impedance mismatches in an open straight duct.

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20223
20182
201722
201627
201529
201433