Research on Pipeline Damage Imaging Technology Based on Ultrasonic Guided Waves

Table 5

Double-defect guided signal data.

Number	First signal reception time ()	End echo signal time ()	Wave speed ()	Near-end defect echo time ()	Proximal defect signal propagation distance ()	Remote defect echo time ()	Remote defect signal propagation distance ()
S1	95.40	1129.95	5219.66	247.55	795.737	362.40	1396.397
S2	95.40	1128.05	5229.26	248.95	803.059	363.10	1400.058
S3	95.40	1127.80	5230.53	253.45	826.594	365.75	1413.917
S4	95.40	1127.85	5230.28	259.70	864.511	370.25	1437.452
S5	95.35	1127.75	5230.53	270.20	914.457	376.85	1472.231
S6	95.40	1127.80	5230.53	259.80	864.249	370.35	1437.975
S7	95.40	1128.05	5229.26	253.45	826.332	365.75	1413.917
S8	95.35	1128.00	5229.26	248.95	802.797	363.00	1399.796