Table 2 Z2335 defect length inversion.

From: Ultrasonic guided wave nondestructive testing of anchorage quality of rebar resin bolt based on EMD-PCA

Numerical value model

Defects length

tu1

tu2

L3

error

Z2335-a

0.05 m

0.445 ms

–

–

9.32%

Z2335-b

0.2 m

0.44 ms

0.54 ms

0.219 ms

9.5%

Z2335-c

0.4 m

0.416 ms

0.570 ms

0.373 ms

6.75%

Z2335-d

0.6 m

0.36 ms

0.60 ms

0.612 ms

2%

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