Research Article
Fractional Fourier Transform for Ultrasonic Chirplet Signal Decomposition
Table 7
Estimated parameters of chirplets (crack C).
| | TOA (us) | Center frequency (MHz) | Amplitude (m-Volt) |
| Reference signal | 34.583 | 9.42 | 363.3 | 34.725 | 10.60 | 54.4 |
| Refracted angle 0° | 38.754 | 9.78 | 14.48 | 38.863 | 12.93 | 1.86 |
| Refracted angle 30° (point a) | 39.784 | 11.02 | 0.58 | 40.029 | 6.06 | 0.19 | 40.560 | 7.68 | 0.13 | 40.122 | 10.63 | 0.06 |
| Refracted angle 45° (point a) | 40.825 | 9.88 | 0.14 | 41.157 | 9.92 | 0.07 | 40.795 | 15.64 | 0.04 | 41.658 | 6.87 | 0.05 |
| Refracted angle 30° (point b) | 39.757 | 7.78 | 0.49 | 39.536 | 5.32 | 0.11 | 39.905 | 4.63 | 0.10 | 39.426 | 11.13 | 0.10 |
| Refracted angle 45° (point b) | 40.632 | 9.09 | 0.21 | 40.270 | 9.65 | 0.07 | 40.468 | 3.40 | 0.16 | 41.100 | 7.97 | 0.07 |
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