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Ultrasonic guided waves are sensitive to small scatterers and can, in principle, be used to detect damage in pipe structures. However, pipes are often subjected to varying environmental and operational conditions (EOC), which can produce false positives or mask the change of interest. We apply singular value decomposition as a robust change detection method in ultrasonic signals. We test the methods...
We study the use of distributed average consensus and compressed sensing to perform decentralized estimation of a field measured by networked sensors. We examine field reconstruction of multiple acoustic sources from isotropic magnitude measurements. Compressed projections of global network observations are spread throughout the network using consensus, after which all nodes may invert the source...
Structural health monitoring of buried pipelines is of vital importance as infrastructures age. Ultrasonic guided waves are a popular method for inspecting buried pipes, due to their potential for long propagation. Unfortunately, the large number of wave modes present, and the effects of dispersion, in a pipeline make analysis of the received signals difficult. We plan to use Time Reversal Acoustics...
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