| NDE | Nondestructive evaluation SHM: Structural health monitoring |
| PZT sensor | Piezoelectric sensor LDV: Laser Doppler vibrometer |
| SNR | Signal-to-noise ratio ACT: Air-coupled transducer |
| UWPI | Ultrasonic wave propagation image RMS: Root mean square |
| AE sensor | Acoustic emission sensor w(x, y, t): Signals of reflected waves |
| wRMS(x, y) | RMS function k: Weighting parameter |
| wRMS(x, y)_Wk | Weighted RMS function |
| log(wRMS(x, y)_Wk | Logarithmic values of the weighted RMS function |
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