This paper proposes the application of nonlinear frequency modulation (nfm) thermography to detect delamination defects in carbon fibre reinforced polymer (cfrp) composites For the radar ambiguity function calculation the zak transform is used in the method. An ultrasonic detection method based on the ht integrated with improved vmd for cfrp laminates with delamination defects xu zhang, congxiao xu, yan fang, wei li
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The synthesis method concerning the nonlinear frequency modulation radar signal is presented in the paper
