Research on Pipeline Damage Imaging Technology Based on Ultrasonic Guided Waves

Table 2

Guide wave propagation distances between the signal receiving point and defect reflection point.

Number	First signal time ()	End echo signal time ()	Transmission speed ()	Damage signal time ()	Time delay ()	Propagation distance ()
S1	95.30	1127.85	5229.77	362.35	267.05	698.61
S2	95.35	1127.80	5230.28	363.00	267.65	701.88
S3	95.45	1127.85	5230.53	365.80	270.35	716.07
S4	95.40	1127.70	5231.04	370.30	274.90	740.01
S5	95.35	1127.86	5229.98	376.45	281.10	772.15
S6	95.30	1127.70	5230.53	370.25	274.95	740.13
S7	95.45	1127.85	5230.53	365.75	270.30	715.81
S8	95.50	1127.80	5231.04	363.10	267.60	701.83