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Proceedings Paper

Computerized time-reversal method for structural health monitoring
Author(s): Chun H. Wang; James T Rose; Fu-Kuo Chang
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Paper Abstract

In this paper an experimental and theoretical investigation of the applicability of the time-reversal concept to guided waves in plates, where the waves are dispersive and of multi-modes. It is shown that although temmporal and spatial focusing can be achieved through time reversal, the dispersive behavior of the flexural waves renders it impossible to exactly reconstruct the waveform of the original excitation. Nevertheless, the temporal and spatial focusing allows the development of a synthetic time-reversal array method for a distributed network of sensors and actuators. This new method, which overcomes the limitation of the conventional phased array method that operates under pulse-echo mode, can considerably enhance the signal strength, thus reducing the number of sensors and actuators required to achieve a given signal-to-noise ratio.

Paper Details

Date Published: 1 August 2003
PDF: 11 pages
Proc. SPIE 5046, Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Composites II, (1 August 2003); doi: 10.1117/12.484668
Show Author Affiliations
Chun H. Wang, Defence Science and Technology Organisation (Australia)
James T Rose, Stanford Univ. (United States)
Fu-Kuo Chang, Stanford Univ. (United States)


Published in SPIE Proceedings Vol. 5046:
Nondestructive Evaluation and Health Monitoring of Aerospace Materials and Composites II
Andrew L. Gyekenyesi; Peter J. Shull, Editor(s)

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