Table 3.
BVID localisation error on SHM layer CFRP plate (50 kHz), actual location (115,160) mm. Baseline recorded at 25 °C with the temperature-compensated current signal, using 5 or 4 transducers. * Indicates 4-transducer arrangement.
| Temperature (°C) | Localisation (mm) | Absolute Error (mm) | |
|---|---|---|---|
| x | y | ||
| −50 | 113.2 | 143.7 | 16.39 |
| −25 | 101.3 | 145.9 | 19.7 |
| 0 | 125.2 | 161.6 | 10.3 |
| 25 | 116.2 | 159.4 | 1.3 |
| 35 | 113.2 | 159.4 | 1.9 |
| 45 | 107.3 | 159.4 | 7.7 |
| 60 | 116.2 | 170.6 | 10.7 |
| −50 * | 113.2 | 139.2 | 20.9 |
| −25 * | 101.3 | 148.2 | 18.1 |
| 0 * | 125.2 | 157.2 | 10.6 |
| 25 * | 137.1 | 154.9 | 22.7 |
| 35 * | 122.2 | 163.9 | 8.2 |
| 45 * | 119.2 | 163.9 | 5.7 |
| 60 * | 119.2 | 168.4 | 9.4 |