Immersible ultrasonic transducer BBUA-DH

measurement

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

Technical specifications

• Series: BBUA-DH
• Available center frequencies: 64 kHz ±5%, 90 kHz ±5%
• Half-power beam angles: 22° ±10% (64 kHz), 17.1° ±10% (90 kHz)
• Minimum impedance: 1,100 Ω ±20% (64 kHz), 180 Ω ±20% (90 kHz)
• Capacitance at 1 kHz: 1,200 pF ±20% (64 kHz), 4,600 pF ±20% (90 kHz)
• Peak operating voltage: <2,250 Vpp
• Operating temperature: -40 to +80°C
• Pressure rating: ≤1 MPa
• Protection rating: IP68
• Confirmed bandwidth (example): 90 kHz ±20% at -3 dB