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- W1524894979 abstract "Time-frequency techniques are applied for mixing signals from a material inspected by a multiple sensor detection system. Ultrasonic sensors are located at the perimeter of a rectangular shaped material evaluated in a pulse-echo scheme. The resulting mixed signal becomes a high-resolution time-frequency image of the material. Different kinds of classification techniques can be applied to this image in order to obtain the defects in the material. In this paper, a simulation and experimental evaluation of the proposed approach are presented. Several time-frequency transforms and the fuzzy c-means are used. In the simulations, backscattering of the material grain is modelled by using Gaussian and K distributions with different signal to noise ratio parameters. The validity of the presented method is assessed through the detection and spatial location of artificial defects in a material with a rectangular shape. The performance of the classification technique in discerning defects buried in the backscattering from the material grain microstructure, is also discussed." @default.
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- W1524894979 date "2005-09-08" @default.
- W1524894979 modified "2023-09-26" @default.
- W1524894979 title "Reconstructing ultrasonic images and flaw detection in time-frequency domain by matching a-scan inspections" @default.
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- W1524894979 doi "https://doi.org/10.5281/zenodo.39094" @default.
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