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Title: Experimental observation of acoustic sub-harmonic diffraction by a grating

Abstract

A diffraction grating is a spatial filter causing sound waves or optical waves to reflect in directions determined by the frequency of the waves and the period of the grating. The classical grating equation is the governing principle that has successfully described the diffraction phenomena caused by gratings. However, in this work, we show experimental observation of the so-called sub-harmonic diffraction in acoustics that cannot be explained by the classical grating equation. Experiments indicate two physical phenomena causing the effect: internal scattering effects within the corrugation causing a phase shift and nonlinear acoustic effects generating new frequencies. This discovery expands our current understanding of the diffraction phenomenon, and it also makes it possible to better design spatial diffraction spectra, such as a rainbow effect in optics with a more complicated color spectrum than a traditional rainbow. The discovery reveals also a possibly new technique to study nonlinear acoustics by exploitation of the natural spatial filtering effect inherent to an acoustic diffraction grating.

Authors:
Publication Date:
OSTI Identifier:
22304052
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 115; Journal Issue: 24; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ACOUSTICS; COLOR; DIFFRACTION; DIFFRACTION GRATINGS; EQUATIONS; FILTERS; NONLINEAR PROBLEMS; PHASE SHIFT; RESOURCE EXPLOITATION; SOUND WAVES; SPECTRA

Citation Formats

Liu, Jingfei, and Declercq, Nico F., E-mail: declercqdepatin@gatech.edu. Experimental observation of acoustic sub-harmonic diffraction by a grating. United States: N. p., 2014. Web. doi:10.1063/1.4884836.
Liu, Jingfei, & Declercq, Nico F., E-mail: declercqdepatin@gatech.edu. Experimental observation of acoustic sub-harmonic diffraction by a grating. United States. https://doi.org/10.1063/1.4884836
Liu, Jingfei, and Declercq, Nico F., E-mail: declercqdepatin@gatech.edu. 2014. "Experimental observation of acoustic sub-harmonic diffraction by a grating". United States. https://doi.org/10.1063/1.4884836.
@article{osti_22304052,
title = {Experimental observation of acoustic sub-harmonic diffraction by a grating},
author = {Liu, Jingfei and Declercq, Nico F., E-mail: declercqdepatin@gatech.edu},
abstractNote = {A diffraction grating is a spatial filter causing sound waves or optical waves to reflect in directions determined by the frequency of the waves and the period of the grating. The classical grating equation is the governing principle that has successfully described the diffraction phenomena caused by gratings. However, in this work, we show experimental observation of the so-called sub-harmonic diffraction in acoustics that cannot be explained by the classical grating equation. Experiments indicate two physical phenomena causing the effect: internal scattering effects within the corrugation causing a phase shift and nonlinear acoustic effects generating new frequencies. This discovery expands our current understanding of the diffraction phenomenon, and it also makes it possible to better design spatial diffraction spectra, such as a rainbow effect in optics with a more complicated color spectrum than a traditional rainbow. The discovery reveals also a possibly new technique to study nonlinear acoustics by exploitation of the natural spatial filtering effect inherent to an acoustic diffraction grating.},
doi = {10.1063/1.4884836},
url = {https://www.osti.gov/biblio/22304052}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 24,
volume = 115,
place = {United States},
year = {Sat Jun 28 00:00:00 EDT 2014},
month = {Sat Jun 28 00:00:00 EDT 2014}
}