Research Article
In-Line Ultrasonic Monitoring for Sediments Stuck on Inner Wall of a Polyvinyl Chloride Pipe
Table 2
The time of flight and the measured thickness of PVC sheets.
| Specimen | T3 | T5 | T8 | T10 | T15 | T22 |
| Time of flight (s) | 2.65 | 4.23 | 7.13 | 8.63 | 13.0 | 19.7 | Actual thickness (mm) | 3.0 | 5.0 | 8.0 | 10.0 | 15.0 | 22.0 | Measured thickness (mm) | 2.99 | 4.77 | 8.05 | 9.74 | 14.64 | 22.24 | Error (%) | 0.19 | 4.52 | 0.61 | 2.59 | 2.39 | 1.11 |
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