2019 | OriginalPaper | Chapter
Extension of acoustic holography to cover higher frequencies
Author : Jørgen Hald
Published in: Automotive Acoustics Conference 2015
Publisher: Springer Fachmedien Wiesbaden
Near-field Acoustical Holography (NAH) is based on performing 2D spatial Discrete Fourier Transforms (DFT), and therefore the method requires a regular mesh of measurement positions. To avoid spatial aliasing problems, the mesh spacing must be somewhat less than half of the acoustic wavelength. In practice, this requirement sets a serious limitation on the upper frequency limit.