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• W2970076382 abstract "Wavenumber imaging with Green's function reconstruction of ultrasonic diffuse fields is used to realize fast imaging of near-surface defects in rails. Ultrasonic phased array has been widely used in industries because of its high sensitivity and strong flexibility. However, the directly measured signal is always complicated by noise caused by physical limitations of the acquisition system. To overcome this problem, the cross-correlations of the diffuse field signals captured by the probe are performed to reconstruct the Green's function. These reconstructed signals can restore the early time information from the noise. Experiments were conducted on rails with near-surface defects. The results confirm the effectiveness of the cross-correlation method to reconstruct the Green's function for the detection of near-surface defects. Different kinds of ultrasonic phased array probes were applied to collect experimental data on the surface of the rails. The Green's function recovery is related to the number of phased array elements and the excitation frequency. In addition, the duration and starting time of the time-windowed diffuse signals were explored in order to achieve high-quality defect images." @default.
• W2970076382 created "2019-09-05" @default.
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• W2970076382 date "2019-08-29" @default.
• W2970076382 modified "2023-10-15" @default.
• W2970076382 title "Wavenumber Imaging of Near-Surface Defects in Rails using Green’s Function Reconstruction of Ultrasonic Diffuse Fields" @default.
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• W2970076382 doi "https://doi.org/10.3390/s19173744" @default.
• W2970076382 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6749193" @default.
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