Research Article
Study on Ultrasonic Characteristics and Prediction of Rock with Different Pore Sizes
Table 3
Amplitude of the first wave before and after drilling of rock samples with different pore sizes at 100 kHz.
| | Rock sample number | Aperture size (mm) | Head wave amplitude before drilling (mv) | Head wave amplitude after drilling (mv) | Amplitude difference (mv) |
| | A1 | 10 | 442 | 394 | 48 | | A2 | 15 | 426 | 361 | 65 | | A3 | 20 | 444 | 347 | 97 | | A4 | 25 | 433 | 325 | 108 | | A5 | 30 | 432 | 295 | 137 |
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