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