Doppler current measurement for underwater monitoring
The BBUA-ADCP series covers 500 kHz, 1 MHz, 2 MHz and 3 MHz configurations for river and ocean current profiling, channel velocity measurement, hydrological monitoring and underwater flow-field research. Each frequency has its own beam angle, electrical matching, temperature range, pressure rating and housing construction.
Frequency and operating configurations
| Center frequency | Half-power beam angle | Minimum impedance | Capacitance at 1 kHz | Peak operating voltage | Operating temperature | Pressure rating | Housing material | Protection rating |
|---|---|---|---|---|---|---|---|---|
| 500 kHz ±5% | 5.8° ±10% | 100 Ω ±20% | 1,500 pF ±20% | <600 Vpp | -20 to +60°C | ≤1 MPa | Stainless steel and plastic | IP68 |
| 1 MHz ±5% | 2.4° ±10% | 15 Ω ±20% | 4,000 pF ±20% | <300 Vpp | -40 to +80°C | ≤1 MPa | 304 stainless steel and PI | IP68 |
| 2 MHz ±5% | 2° ±10% | 3.5 Ω ±20% | 5,600 pF ±20% | <150 Vpp | -40 to +80°C | ≤1 MPa | 304 stainless steel and PI | IP68 |
| 3 MHz ±5% | 2.9° ±10% | 10 Ω ±20% | 1,000 pF ±20% | <95 Vpp | -20 to +60°C | ≤1 MPa | 304 stainless steel and plastic | IP68 |
Confirmed range and bandwidth data
| Frequency | Confirmed characteristic |
|---|---|
| 1 MHz | Reference range 0.05 to 3 m; bandwidth ±20% at -3 dB |
| 2 MHz | Reference range 0.03 to 2 m |
Applications and selection
- River and ocean current profiling
- Channel velocity measurement
- Hydrological monitoring
- Underwater flow-field research
Frequency, beam angle, acoustic path, electrical matching, temperature, pressure and housing construction should be selected as one compatible configuration for the required depth, velocity range and spatial resolution.