Results 21 to 30 of about 558 (180)
Interior Fourier Near-Field Acoustical Holography Using Energy Density [PDF]
, 2010 Near-field acoustical holography (NAH) is used to reconstruct three-dimensional acoustic fields from a two-dimensional planar measurement. During previous work at BYU, a method has been developed called energy-based near-field acoustical holography (ENAH)
Kent L. Gee +7 more
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[Grant application] Near-field Acoustical Holography - a new sensor concept for methods of active noise reduction [PDF]
Anlage A: 'Beschreibung des Vorhabens' zum Forschungsantrag an die Deutsche Forschungsgemeinschaft (DFG)The research hypothesis of the project comprises the development process of a sensor principle based on near-field acoustical holography for active ...
Ungnad, Steffen
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A partial field decomposition algorithm and its examples for near-field acoustic holography [PDF]
, 2004 In this paper we introduce a practical algorithm that can accurately implement partial field decomposition for near-field acoustic holography (NAH). Unlike other methods, the algorithm does not require sensors near sources because it uses calculations ...
Kim, Yang-Hann +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
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Near field acoustic holography with particle velocity transducers [PDF]
The Journal of the Acoustical Society of America, 2005 Near field acoustic holography is usually based on measurement of the pressure. This paper describes an investigation of an alternative technique that involves measuring the normal component of the acoustic particle velocity. A simulation study shows that there is no appreciable difference between the quality of predictions of the pressure based on ...
Jacobsen, Finn, Liu, Yang
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Direct extrapolation in near‐field acoustic holography
Electronics Letters, 2015 The size and shape of a reconstruction surface is the same as a holography surface in conventional near‐field acoustic holography (NAH), which limits the size and shape of the measurement surface. To reduce the measurement points and use any shape of measurement array, the direct extrapolation in NAH based on wave superposition is proposed.
Jin Mao +4 more
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Super‐Resolution and High‐Data‐Density Acoustic Meta‐Hologram via Amplitude and Phase Coupling
Advanced Science, EarlyView.A super‐resolution acoustic meta‐hologram utilizes amplitude‐phase coupling under energy conservation constraints to overcome the traditional diffraction limit. This conceptually advanced approach achieves high‐fidelity acoustic field reconstruction and dense information transmission, unlocking new potentials for high‐resolution acoustic imaging and ...
Xiao Guo +15 more
wiley +1 more source
Scan and paint: theory and practice of a sound field visualization method [PDF]
, 2013 Sound visualization techniques have played a key role in the development of acoustics throughout history. The development of measurement apparatus and techniques for displaying sound and vibration phenomena has provided excellent tools for building ...
Carrillo Pousa, Graciano +4 more
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Small, EarlyView.This study introduces an acoustics‐assisted tissue engineering approach, termed “Acoustic Tweezers‐Assisted Biomaterial Molding in Petri Dishes (TAMP),” which enables the fabrication of tissues with customizable extracellular matrix (ECM) geometries and various acoustically constructed internal cellular architectures, including parallel elongated ...
Yingshan Du +11 more
wiley +1 more source
Nearfield Acoustical Holography Research & Application On Compressor & Refrigerator [PDF]
, 2012 In this paper, an algebraic formulation which expresses the dimensionless rate of entropy generation as a function of the heat exchanger geometry (number of transfer units), the thermal-hydraulic characteristics (friction factor and Colburn j-factor ...
Jianwen, Xu +2 more
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