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EURASIP Journal on Image and Video Processing

Table 2 Test results of three groups

From: Non-destructive inspection on anchorage defect of hollow grouted rock bolt using wavelet transform analysis

Sample number

Propagation time (us)

Sample length (mm)

Wave velocity (m/s)

1

1082

2400

4436

2

1075

2400

4465

3

1130

2400

4247

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