Table 3 Cavity size and sensing distance
From: An impact echo method to detect cavities between railway track slabs and soil foundation
Cavity size (cm) | Y (cm) | X (cm) Sensing distance | |||||
|---|---|---|---|---|---|---|---|
t | B | L | cm | cm | cm | cm | |
5 | 5 | 5 | 0 | 5 | 10 | 15 | 20 |
1.25 | 5 | 5 | 0 | 5 | 10 | 15 | 20 |
0.75 | 5 | 5 | 0 | 5 | 10 | 15 | 20 |
0.3 | 5 | 5 | 0 | 5 | 10 | 15 | 20 |
1 | 40 | 40 | 0 | 5 | 10 | 15 | 20 |
1.5 | 40 | 40 | 0 | 5 | 10 | 15 | 20 |