Table 2.
Values of the reflection coefficient for three differents angles. The angle of the sensors with the normal of the test specimen surface are 30 degrees.
| Air-brick | Air-gypsum | |
|---|---|---|
| R (25°) | 0.999 | 0.999 |
| R (30°) | 0.999 | 0.999 |
| R (35°) | 1.000 | 1.000 |
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