Results 71 to 80 of about 1,225 (190)
Double resolution microwave holography [PDF]
, 1976 Includes bibliographical references.This thesis endeavours to record the development and subsequent evaluation of a simple technique for the recording of microwave holograms using common hardware components, which offers the possibility of significant ...
Nilsen, Christopher Shakespeare
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Noise source localization on washing machines by conformal array technique and near field acoustic holography [PDF]
, 2010 The acoustic emission of a washing machine has been deeply studied by comparing three different techniques, which are: - conventional acoustic intensity, - planar near-field acoustic holography and - conformal array technique based on the Helmotz ...
Ravi Beniwal +9 more
core +1 more source
Water‐Wave Pancharatnam‐Berry Phase Induced by 4D Spin‐Orbit State Evolution
Advanced Science, Volume 13, Issue 2, 9 January 2026.The first observation of the Pancharatnam‐Berry (PB) phase in water waves is reported, revealing its extraordinary properties including unbounded phase values, spin‐momentum‐locked unidirectional channels, and a Poincaré hypersphere representation. These findings demonstrate the universality of the PB phase across different wave systems and in higher ...
Wanyue Xiao +3 more
wiley +1 more source
Advances in Mathematical Physics, Volume 2026, Issue 1, 2026.This research work provides a comprehensive investigation of the M‐fractional paraxial wave equation (M‐fPWE) in describing complex optical phenomena in telecommunication systems and nonlinear media, focusing on the dynamical analysis of optical soliton solutions, the impact of M‐fractional parameters, stability, multistability, and the chaotic nature ...
Md. Mamunur Roshid +5 more
wiley +1 more source
Patch near-field acoustic holography: The influence of acoustic contributions from outside the source [PDF]
, 2009 It is a requirement of conventional Near-field Acoustic Holography that the measurement area covers the entire surface of the source. In the case of Patch Near-field Acoustic Holography (patch NAH), the measurement area can be reduced to cover only a ...
Zhang, Yong-Bin +2 more
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ICSV14 EXTENDING THE USABILITY OF NEAR-FIELD ACOUSTIC HOLOGRAPHY AND BEAMFORMING BY USING FOCALIZATION [PDF]
, 2020 In view of source localization techniques, two methods, Near-Field Acoustic Holography (NAH) and Beamforming, are widely used and well-known techniques. Both techniques have their advantages and disadvantages.
Karl Jansen +3 more
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Truncated aperture extrapolation for Fourier-based near-field acoustic holography by means of border-padding [PDF]
, 2009 Although near-field acoustic holography (NAH) is recognized as a powerful and extremely fast acoustic imaging method based on the inverse solution of the wave-equation, its practical implementation has suffered from problems with the use of the discrete ...
Lopez Arteaga, Ines, +13 more
core +1 more source
Study of Near-Field Acoustic Holography Methods on Models [PDF]
, 2019 Tato bakalářská práce se zabývá rozborem metod akustické holografie v blízkém poli a vhodných regularizačních technik s následnou simulaci metody SONAH v prostředí MATLAB. V této práci je rozebraná Tichonovova regularizační metoda.
Svetlana Lukianova
core
, 2013 This bachelor´s thesis is focused on description and process during contactless identification of sound source for near and far field. Principles of individual methods of acoustic holography are relatively shortly described and for details of this ...
Vacula, Jan
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Data extrapolation method for near-field acoustic holography
Journal of the Acoustical Society of Japan (E), 1998 We propose a new data smoothing method for near-field acoustic holography (NAH) with the aid of the data extrapolation. This method can reduce the error energy which comes from the finiteness of the measurement aperture. We illustrate our calculational results by using of the computer simulations which apply to the numerically generated data by Fast ...
openaire +2 more sources