Comparative study of ultrasonic techniques for reconstructing the multilayer structure of composites

The multilayer structure of fiber-reinforced polymers may be extracted by ultrasonic pulse-echo inspection. Depending on the employed frequency and subsequent processing methodology, different depth resolution dynamic range can achieved. This study compares performance approaches for extracting ply-by-ply multilayered composites. following methodologies are studied: Method 1: 50 MHz, 15 5 MHz ultrasound with low-pass filtering using analysis instantaneous amplitude, 2: Wiener deconvolution (and autoregressive spectral extrapolation) 3: or log-Gabor phase. In simulation study, various techniques is investigated synthetic data representative a 24-ply carbon fiber reinforced polymer. robustness evaluated signal-to-noise ratios. further experimental cross-ply presented in form both B-scan C-scan images. thickness each ply estimated quantitative analysis. obtained results indicate that coupled to analytic-signal filter shows best reconstructing studied