Object Characterization Based on Multispectral Acoustic Imaging

概要

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In previous studies, acoustic imaging was conducted using a single frequency or a limited number of frequencies that were not sufficient to clearly describe and explain the object characteristics. In this study, multispectral acoustic imaging (MSAI) is proposed to reveal rich information of object characteristics. An experimental study on object surfaces is conducted to verify the validity of the technique. Acoustic imaging of object surfaces is performed on the basis of a significant number of spectra over a wide frequency range. Using the frequency-swept irradiation from 1 to 20 kHz at 30 Hz intervals, we demonstrate the visualization of the following three different object surfaces: a rigid surface with small holes with and without a piece of thin paper covering the surface, and a boundary between wood and rubber plates. The distributions of sound pressure reconstructed at each frequency by a near-field acoustic holography (NAH) technique are shown. In multispectral acoustic imaging, frequency dependence provides us rich information about the surface shape and material properties of the objects; thus, the characteristics of the surfaces are successfully visualized.
2013-12-25