Fractional Fourier Transform for Ultrasonic Chirplet Signal Decomposition
Figure 13
Experimental data of Crack D (with normalized amplitudes) superimposed with the estimated chirplets (depicted in dashed red line). (a) Front surface reference signal superimposed with sum of 2 chirplets. (b) Experimental data (refracted angle 0) superimposed with sum of 2 chirplets. (c) Experimental data (refracted angle 30) superimposed with sum of 4 chirplets. (d) Experimental data (refracted angle 45) superimposed with sum of 4 chirplets.
