Accuracy Improvement of Reconstruction in Near-Field Acoustical Holography by Applying Data Extrapolation Method

概要

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Near-field acoustical holography (NAH) is a non-contacting measurement method to visualize structural vibrations by means of backward reconstruction. A relevant data-smoothing process is necessary for the NAH experiments. We had previously proposed a new data-smoothing method with the aid of data extrapolation. In this paper, we report the effectiveness of this proposed method based on the experimental results. Furthermore, our data-smoothing method is modified for applications to the generalized NAH (GENAH). The experimental results show that the reconstruction error of the surface velocity by the proposed method is less than one-fifth of that by the conventional real-space window method for S/N = 33 dB. These results indicate that the prospect of improving the accuracy of reconstruction in NAH for the quantitative analysis of structural vibrations is obtained by the proposed method.
社団法人応用物理学会の論文
1998-05-30