Ultrasonic sensing for boreholes and drilling equipment
The BBUA-DH series provides 64 kHz and 90 kHz configurations for downhole drilling measurement, borehole-wall inspection, subsurface acoustic sensing and integration into drilling equipment. The two frequencies have different beam angles and electrical characteristics.
Frequency and operating configurations
| Center frequency | Half-power beam angle | Minimum impedance | Capacitance at 1 kHz | Peak operating voltage | Operating temperature | Pressure rating | Protection rating |
|---|---|---|---|---|---|---|---|
| 64 kHz ±5% | 22° ±10% | 1,100 Ω ±20% | 1,200 pF ±20% | <2,250 Vpp | -40 to +80°C | ≤1 MPa | IP68 |
| 90 kHz ±5% | 17.1° ±10% | 180 Ω ±20% | 4,600 pF ±20% | <2,250 Vpp | -40 to +80°C | ≤1 MPa | IP68 |
Confirmed bandwidth
| Frequency | Bandwidth |
|---|---|
| 90 kHz | ±20% at -3 dB |
Applications and selection
- Measurement during downhole drilling
- Inspection of borehole walls
- Subsurface acoustic sensing
- Integration into drilling equipment
Frequency, beam angle, bandwidth, electrical matching, borehole diameter, sensing distance, operating temperature and pressure should be selected as one compatible configuration for the target structure and drilling system.