Table 3 Z2335 defect location inversion.

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

Numerical model

Model defect length

Upper interface reflection time point

Lower interface reflection time point

Inversion defect length

Error

Z2335-front end

0.2 m

0.379 ms

0.482 ms

0.227 m

13.5%

Z2335-mid-ended

0.2 m

0.44 ms

0.54 ms

0.219 m

9.5%

Z2335-back end

0.2 m

0.5898 ms

0.6920 ms

0.225 m

12.5%

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