Abstract
Abstract In the field of non-destructive investigations, the arrival time of the elastic waves is the important parameters to visualize the locations of the failures and/or elastic wave velocity distributions that are generally used for the soundness evaluation. The accuracy of the visualization depends on the accuracy of the arrival times, and it is demanded that the arrival times are detected automatically with required accuracy from huge amount of the elastic wave measurement data for the practical applications. In this paper, a method of the arrival time detection is proposed on the basis of the sparse matrix computation. The root mean square voltages in the noise of the wave form, is used as an index to separate the elastic waves between the noise and the signal, and the boundary of the index between the noise and the signal in the wave forms is determined in the sparse matrix. Therefore, the arrival times located in the boundary of the noise and it is detected by sparse matrix computations. The proposed method is verified on the model tests and compared with the conventional method, and it was confirmed that the proposed method detects more arrival time accurately in comparison with the conventional method.
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