Fractional Fourier Transform for Ultrasonic Chirplet Signal Decomposition
Figure 12
Experimental data of crack C (with normalized amplitudes) superimposed with the estimated chirplets. (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 at point a) superimposed with sum of 4 chirplets. (d) Experimental data (refracted angle 30 at point b) superimposed with sum of 4 chirplets. (e) Experimental data (refracted angle 45 at point a) superimposed with sum of 4 chirplets. (f) Experimental data (refracted angle 45 at point b) superimposed with sum of 4 chirplets.