| AA | Amplitude Attenuation |
| ASME | American Society of Mechanical Engineers |
| CFS | Centroid Frequency Shift method |
| ECT | Electric Capacity Tomography |
| FA | First Arrival |
| GEW | Guided Elastic Waves |
| GUW | Guided Ultrasonic Waves |
| NDE | Non-Destructive Evaluation |
| SA | Second Arrival |
| SR | Spectral Ratio |
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