Conference_programme: 21.1 - Source localization and acoustic array processing
Lecture: Modelling space-variant reflections in wavenumber array spectra
Author(s): Zea Elias
Summary:
This paper introduces and investigates a novel single-layer Fourier-based near-field acoustic holography (NAH) technique suited to measurements with a linear microphone array in the presence of a reflector that is perpendicular to the array. The general idea is to model the reflected plane waves as weighted versions of the incident waves. Numerical experiments are performed in order to test the reconstructions against the conventional (free-field) NAH technique and reference results obtained from theoretical calculations. The most important outcome of this paper is that the reconstruction errors decrease as the wavelength of the plane waves is an integer multiple of the array length, and this is attributed to spectral leakage and windowing artefacts introduced by the use of the spatial Fourier transform. In the case of greatest leakage, that is, the wavenumbers of the plane waves are exactly in the middle of two adjacent bins of the wavenumber domain, the errors can exceed 100%. In the case of no leakage, the errors are no greater than 25%. Overall, this study points towards further investigation of the method.
Corresponding author
Name: Mr Elias Zea
e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Country: Sweden
