Research Article

Fractional Fourier Transform for Ultrasonic Chirplet Signal Decomposition

Table 6

Estimated parameters of chirplets (crack D).

TOA (us)Center frequency (MHz)Amplitude (m-Volt)

Reference signal34.5839.42363.3
34.72510.6054.4

Refracted angle 0°38.77610.384.64
38.89113.060.50

Refracted angle 30°39.7777.680.50
40.0409.100.14
39.67412.570.18
39.8612.180.03

Refracted angle 45°40.6779.850.17
40.9569.850.07
40.6754.510.04
40.62015.650.03