Ultrasonic Flaw Imaging via Multipath Exploitation

Table 1

Predicted and measured time delays of multipath signals for the specular flaw shown in Figure 7 (unit: μs).

Transmit position	Receive position	Calculated time delay					Measured time delay
		Bottom	Flaw	MP I	MP II-A	MP II-B	Bottom	Flaw	MP I	MP II-A/B
A	D	24.592	13.986	32.562	37.569	37.569	24.600	14.050	32.450	37.200
	C	24.265	13.513	32.364	37.465	37.096	24.280	13.550	32.180	36.880
	B	24.067	13.513	32.364	37.465	37.096	24.070	13.600	32.330	36.730
B	D	24.265	13.513	32.364	37.096	37.465	24.280	13.570	32.180	36.800
	C	24.067	13.040	32.166	36.991	36.991	24.070	13.030	32.180	36.520
	A	24.067	13.513	32.364	37.096	37.465	24.070	13.550	32.270	36.630
C	D	24.067	13.513	32.364	37.096	37.465	24.070	13.630	32.220	36.700
	B	24.067	13.040	32.166	36.991	36.991	24.070	13.030	32.380	36.500
	A	24.265	13.513	32.364	37.096	37.465	24.280	13.550	32.180	36.850
D	C	24.067	13.513	32.364	37.465	37.096	24.070	13.630	32.220	36.670
	B	24.265	13.513	32.364	37.465	37.096	24.280	13.550	32.180	36.800
	A	24.592	13.986	32.562	37.569	37.569	24.600	14.030	32.430	37.180