Characterization of acoustic material at oblique incidence using a spherical microphone array

2020 ◽  
Vol 147 (5) ◽  
pp. 3613-3625
Author(s):  
Samuel Dupont ◽  
Manuel Melon ◽  
Alain Berry
Keyword(s):  
Oblique Incidence ◽  
Microphone Array

scholarly journals Characterization of rigid porous medium via ultrasonic reflected waves at oblique incidence

2015 ◽  
Vol 138 (3) ◽  
pp. 1940-1940
Author(s):  
Mustapha Sadouki ◽  
Amine Berbiche ◽  
Mohamed fellah ◽  
Zine El Abidine fellah ◽  
Claude Depollier
Keyword(s):  
Porous Medium ◽  
Oblique Incidence ◽  
Reflected Waves

A Comparison of Frequency-Domain Microphone Array Methods for the Characterization of Rotating Broadband Noise Sources

2019 ◽  
Vol 105 (1) ◽  
pp. 66-74 ◽  
Author(s):  
Christof Ocker ◽  
Gert Herold ◽  
Florian Krömer ◽  
Wolfram Pannert ◽  
Ennes Sarradj ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Microphone Array ◽  
Broadband Noise ◽  
Noise Sources

scholarly journals Characterization of a nematic PALC at large oblique incidence angles

2007 ◽  
Vol 15 (16) ◽  
pp. 10381 ◽  
Author(s):  
C. C. Tsai ◽  
H. C. Wei ◽  
C. H. Hsieh ◽  
L. P. Yu ◽  
C. R. Yu ◽  
...  
Keyword(s):  
Oblique Incidence

Extremal Characterization of Band Gaps in Nonlinear Gratings

2003 ◽  
Vol 12 (02) ◽  
pp. 135-148 ◽  
Author(s):  
E. van Groesen ◽  
A. Sopaheluwakan
Keyword(s):  
Finite Element ◽  
Band Gap ◽  
Oblique Incidence ◽  
Band Gaps ◽  
Simple Criterion ◽  
Variational Characterization ◽  
Finite Element Scheme ◽  
Element Scheme ◽  
Comparison Arguments

In this paper we present an explicit extremal characterization of the edges of the lowest band gap in gratings; we restrict here to the case of TE-modes, but the TM case can be treated similarly. The characterization is valid for linear and Kerr-nonlinear gratings, for smooth as well as for step-variations of the index and the coefficient of nonlinearity. The variational characterization allows one to derive monotonicity properties by using simple comparison arguments. For instance, the monotonic shift of the band gap as a function of the angle of oblique incidence is proved, leading to a simple criterion for omni-directionally for the band gap. Rough estimates of the band gaps can be obtained by substituting suitable trial fields in the governing functionals, while the same formulation can also be used to design a Finite Element scheme for accurate calculations.

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