Near Field Distance of Flat Transducers in Water | ||||
Frequency | Element Diameter | N | Focal Length (PTF)** | |
Min | Max | |||
(MHz) | (inches) | (inches) | (inches) | (inches) |
0.5 | 1.50 | 4.757 | 2.15 | 3.80 |
1.125 | 2.661 | 1.50 | 2.10 | |
1.00 | 2.095 | 1.25 | 1.65 | |
0.75 | 1.164 | 0.78 | 0.93 | |
1.0 | 1.50 | 9.559 | 2.50 | 7.65 |
1.125 | 5.366 | 1.90 | 4.30 | |
1.00 | 4.235 | 1.625 | 3.38 | |
0.75 | 2.372 | 1.00 | 1.90 | |
0.50 | 1.043 | 0.60 | 0.80 | |
2.25 | 1.50 | 21.534 | 2.70 | 14.50 |
1.125 | 12.099 | 2.15 | 9.50 | |
1.00 | 9.554 | 1.875 | 7.60 | |
0.75 | 5.364 | 1.00 | 4.30 | |
0.50 | 2.374 | 0.80 | 1.90 | |
0.375 | 1.329 | 0.50 | 1.06 | |
0.25 | 0.584 | 0.35 | 0.45 | |
3.5 | 1.00 | 14.868 | 1.95 | 11.5 |
0.75 | 8.350 | 1.00 | 6.65 | |
0.50 | 3.699 | 0.83 | 2.95 | |
0.375 | 2.073 | 0.60 | 1.65 | |
0.25 | 0.914 | 0.385 | 0.70 | |
5.0 | 1.00 | 21.243 | 1.95 | 14.40‡ |
0.75 | 11.932 | 1.00 | 9.50 | |
0.50 | 5.287 | 0.75 | 4.20 | |
0.375 | 2.965 | 0.60 | 2.35 | |
0.25 | 1.309 | 0.43 | 1.00 | |
7.5 | 0.75 | 17.900 | 1.00 | 12.75‡ |
0.50 | 7.933 | 0.75 | 6.30‡ | |
10 | 1.00 | 42.490 | 2.00 | 20.00‡ |
0.75 | 23.868 | 1.00 | 15.375‡ | |
0.50 | 10.579 | 0.75 | 8.40‡ | |
0.375 | 5.934 | 0.60 | 4.75‡ | |
0.25 | 2.622 | 0.46 | 2.10 | |
15 | 0.50 | 15.870 | 0.75 | 11.75‡ |
0.375 | 8.902 | 0.60 | 7.10‡ | |
0.25 | 3.935 | 0.50 | 3.15‡ | |
20 | 0.25 | 5.247 | 0.50 | 4.20‡ |
0.125 | 1.290 | 0.25 | 1.00‡ | |
25 | 0.25 | 6.559 | 0.50 | 5.25‡ |