Civil Engineering Reference
In-Depth Information
Sonic profile from twin tube test
0
0
2
2
4
4
defect
Sound shaft
6
6
defect
8
8
10
10
12
12
14
14
200
400
600
800
Time in microsec
16
16
18
18
200
400
600
800
Time in microsec
(a)
20
20
(b)
