Research on Pipeline Damage Imaging Technology Based on Ultrasonic Guided Waves

Table 4

Guided wave propagation distances between the receiving point and the defect boundary.

Number	First signal time ()	End echo signal time ()	Transmission speed ()	Damage signal time ()	Time delay ()	Propagation distance ()
S1	95.30	1127.75	5230.28	362.40	267.10	1397.01
S2	95.30	1127.60	5231.04	362.55	267.25	1397.99
S3	95.25	1127.75	5230.02	364.40	269.15	1407.66
S4	95.40	1127.55	5231.80	368.25	272.85	1427.50
S5	95.45	1127.65	5231.54	373.85	278.40	1456.46
S6	95.35	1127.60	5231.29	372.45	277.10	1449.59
S7	95.25	1127.75	5230.02	367.15	271.90	1422.57
S8	95.40	1127.75	5230.78	363.80	268.40	1404.47