Table I.
Transducer and TDS parameters for three sets of experiments for low, intermediate, and high frequency ranges.
| Frequency Range: | Low | Intermediate | High | |
|---|---|---|---|---|
| Source Transducer |
Center frequency (MHz) | 1 | 10 | 25 |
| Diameter (mm) | 40 | 12.7 | 6.25 | |
| Focal Length (mm) | 200 | ∞ | 25 | |
| Receiving Transducer |
Center frequency (MHz) | (hydrophone) |
10 | 25 |
| Diameter (mm) | 1 | 12.7 | 6.25 | |
| Focal Length (mm) | ∞ | ∞ | 25 | |
| Source / Receiver Separation z (cm) | 15 | 30 | 10 | |
| TDS Parameters |
Delay Time tD = z/c (μs) | 101 | 203 | 68 |
| Maximum Sweep Frequency (MHz) | 20 | 20 | 40 | |
| Sweep Time (s) | 0.2 | 0.334 | 0.267 | |
| Sweep Rate S (MHz/s) | 100 | 60 | 150 | |
| TDS Offset Frequency Δf = S tD (kHz) | 10.1 | 12.1 | 10.1 | |
| Filter bandwidth (BW) (kHz) | 0.67 | 0.4 | 1 | |
| Frequency Resolution S / BW (MHz) | 0.15 | 0.15 | 0.15 | |
| Time resolution Δt = BW / S (μs) | 6.7 | 6.7 | 6.7 |