Spatio-Temporal Gradient Analysis for Detecting Defects(Applications of Signal Processing)(<Special Section>Digital Signal Processing)

概要

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This paper provides a novel signal processing for detecting defects based on the spatio-temporal gradient analysis over the Lambwave field. The proposed processing classifies the wave field through the rank of the covariance matrix which is defined by the four-dimensional vector with following components : a vertical displacement, its vertical velocity, and a pair of out-of-plane shearing strains. The covariance matrix provides the information about defects. Its determinant, therefore, is proposed as the inhomogeneity-index of the object surface. In this study, the physical meanings of the proposed index are shown, the computational process in the Lamb-wave field near the defects is discussed and their behaviors are investigated through FDTD-simulations and acoustic experiments.
一般社団法人電子情報通信学会の論文
2004-08-01