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Acoustic performance of TUTs with different thicknesses of PMMA matching layer.
| Aperture size (mm × mm) | PMMA thickness (μm) | fc (MHz) | BW (%) | Echo amplitude (V) |
|---|---|---|---|---|
| 9.0 × 9.0 | 34 | 12.75/22.9 | 71.4/19.2 | 1.04 |
| 9.0 × 9.0 | 24 | 20.8 | 50.2 | 0.80 |
| 9.0 × 9.0 | 17 | 20.4 | 27.2 | 0.64 |
| 6.3 × 6.3 | 13 | 27.8 | 56.1 | 0.55 |
