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- W2068001075 abstract "Conventional ultrasonic pulse-echo imaging techniques, typically processed in the time domain, are generally limited by the large pulse widths, resulting in inaccurate and confusing B-scan images. This paper deals with a high fidelity ultrasonic pulse-echo signal processing technique suitable for detecting delaminations in thin composite laminates. In this processing scheme, broadband pulse-echo A-scan signals are reconstructed in the transform domain using complex cepstrum and homomorphic deconvolution techniques. The technique is implemented for 8-ply and 16-ply quasi-isotropic graphite/epoxy laminates with embedded Teflon film patches and damage induced by low velocity impact loading. The technique shows excellent improvement in the time resolution so that it can be used effectively for extracting exact time-of-flight information and then constructing accurate B-scan and three-dimensional images of defects in thin composites. Moreover, the approach automatically measures the time delay from the front surface, i.e., it follows the front face, making it useful for inspecting slightly warped laminates or the parts with irregular surfaces." @default.
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- W2068001075 title "A high-fidelity ultrasonic pulse-echo scheme for detecting delaminations in composite laminates" @default.
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- W2068001075 doi "https://doi.org/10.1016/s1359-8368(99)00017-7" @default.
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