| THz | Terahertz |
| TDS | Time-Domain Spectroscopy |
| THz-TDS | Terahertz Time-Domain Spectroscopy |
| NDT | Non-Destructive Testing |
| CT | Computed Tomography |
| NMR | Nuclear Magnetic Resonance |
| SEM | Scanning Electron Microscopy |
| XRD | X-ray Diffraction |
| ERT | Electrical Resistivity Tomography |
| PCA | Principal Component Analysis |
| SVM | Support Vector Machine |
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