Table 1.
Properties of the P-876.A12 and LDT4-028k transducers.
| Properties | P-876.A12 | LDT4-028k |
|---|---|---|
| Density, ρ (g/cm3) | 7.8 | 1.8 |
| Curié temperature, Tc (°C) | 350 | 100 |
| Relative permittivity, εr | 1650–1750 | 12–13 |
| Dielectric loss factor, σ | 0.02 | 0.02 |
| Coupling factor, kt | 0.47 | 0.14 |
| Coupling factor, k31 | 0.35 | 0.12 |
| Coupling factor, k33 | 0.69 | - |
| Piezo charge coefficient, |d31| (10−12 C/N) | 180 | 23 |
| Piezo charge coefficient, |d33| (10−12 C/N) | 400 | 33 |
| Piezo voltage coefficient,|g31| (10−3 V m/N) | 11.3 | 216 |
| Piezo voltage coefficient,|g33| (10−3 V m/N) | 25 | 330 |
| Young’s modulus, Y (109 N/m2) | 55.5 | 3.1 |
| Minimum radius curvature, rc (mm) | 20 | 5 |
| Active vol. dimensions (l × w × t) (mm) | (50 × 30 × 0.2) | (156 × 19 × 0.028) |
| Electrical capacitance, C (10−9 F) | 90 | 12 |