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17 April 2013 Implementation of a novel imaging technique in an existing structural health monitoring system
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In this paper, a novel imaging technique is assessed with a structural health monitoring (SHM) system based on a sparse array of piezoceramic sensors and actuators for in-plane inspection. The imaging approach used in this system is based on the Time-of-Flight (ToF), and the knowledge of the velocity of ultrasonic waves in the structure. While this technique assumes non-dispersive wave propagation, the proposed imaging technique exploits the dispersion of waves as it is based on the phase velocity. The signal measured at a given sensor is correlated with a theoretical prediction of a propagated burst in the structure and, combining the results for multiple sensors, an image of the reflectors in the structure is obtained. This paper presents the implementation of the novel imaging technique in an existing system, including considerations for physical access to the signals and their conditioning. The performance of the existing imaging approach is compared with the novel imaging technique proposed for two test cases. The first assessment is conducted on a simple aluminum plate where magnets are used to simulate a defect. Then, the assessment of the novel imaging techniques is conducted on riveted plates with simulated cracks of different lengths. Imaging results are presented for a number of damage detection scenarios on these structures. The novel imaging technique is shown to improve imaging localization, resolution and robustness, while allowing fast implementation.
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Patrice Masson, Nicolas Quaegebeur, Adrien Brunel, and Nezih Mrad "Implementation of a novel imaging technique in an existing structural health monitoring system", Proc. SPIE 8695, Health Monitoring of Structural and Biological Systems 2013, 86951I (17 April 2013);

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