Research Article
In-Line Ultrasonic Monitoring for Sediments Stuck on Inner Wall of a Polyvinyl Chloride Pipe
Table 3
The time of flight and the measured thickness of foreign substances.
| | Specimen | S1 | S2 | S3 | S4 | S5 |
| | Time of flight (s) | 3.92 | 6.645 | 7.605 | 10.2 | 11.76 | | Actual thickness (mm) | 3.92 | 6.79 | 7.49 | 10.05 | 11.63 | | Measured thickness (mm) | 3.92 | 6.65 | 7.61 | 10.20 | 11.76 | | Error (%) | 0.00 | 2.14 | 1.54 | 1.49 | 1.12 |
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