Table 4 Non-destructive detect recognition parameters of sample 5#
Character point number | Character point 1 | Character point 2 | Character point3 | Character point 4 |
|---|---|---|---|---|
Propagation time (us) | 892 | 1101 | 1180 | 1500 |
Time difference (us) | 209 | 79 | 320 | |
Wave velocity (m/s) | 1885 | 4356 | 1885 | |
Length (mm) | 196 | 172 | 301 | |
Actual length (mm) | 200 | 160 | 300 | |
Error rate (%) | 1.2 | 7.5 | 0.3 | |