Table 7 Measurement of defect position in flat steel with the same length but varying width.
From: Time frequency analysis of elastic wave PSO OMP for defects in flat steel of down conductors
NO | L(m) | Cross-Corr Peak Fre(KHz) | Cross-Corr Delay Time(ms) | Celerity (m/s) | Defect Width (mm) | Auto-Corr Peak Fre(KHz) | Auto-Corr Delay Time(ms) | Defect Location (m) | Relative Error (%) |
|---|---|---|---|---|---|---|---|---|---|
1 | 2 | 9.164 | 0.0846 | 1157.41 | 10 | 9.469 | 0.1064 | 1.158 | 3.5 |
2 | 2 | 8.858 | 0.1008 | 992.06 | 15 | 8.553 | 0.1056 | 1.101 | 8.25 |
3 | 2 | 8.858 | 0.0944 | 1059.32 | 20 | 8.545 | 0.1136 | 1.161 | 3.9 |
4 | 2 | 9.160 | 0.0928 | 1077.58 | 25 | 8.553 | 0.1296 | 1.19 | 0.8 |
