Benthowave Instrument Inc.

BENTHOWAVE INSTRUMENT INC. Acoustic Transducer & System 

Low Noise Low Power Wide Bandwidth Preamplifier

BII-1070 Low Noise Low Power Wide Bandwidth Preamplifier

BII-1070 is designed to amplify weak signals resulting from the propagation loss (spreading and attenuation loss): Ultrasonic Flaw/Flow Detection, Seafloor Mapping System, Multibeam Imaging Sonar, Sidescan Sonar, Echosounder, Underwater Velocimeter, Doppler Sonar (Acoustic Doppler Current Profiler), etc...

How to choose -3dB cut-off frequency of band pass filter in BII-1070 series:
When BII-1070 is used in active Sonar system, its cut-off frequency shall match the bandwidth of the known Sonar signals as close as possible. With appropriate band pass filter, BII-1070 can attenuate the unwanted noises and improve the SNR (signal-to-noise ratio) prior to signal detection.

How to calculate self-noise voltage level of BII-1070 series:
Output Self-Noise Voltage Level = Gain * square root[∫(Total Input Noise Density*Total Input Noise Density)df].  f: frequency in Hz
Output Self-Noise Voltage Level is proportional to the bandwidth of the preamplifier.

Technical notes
The cable has adverse effects on the signal quality in high frequency range. The longer the cable is, the worse the adverse effects is. If you use long cable in your project, you may specify customized output impedance of BII's preamplifiers to match cable impedance and the DAQ input impedance, for example, customized 50 ohms output impedance of BII preamplifier for 50 ohms RG58 coax of DAQ system.

Suggested Application   Features  Related Products 
Ultrasonic Flaw/Flow Detection
Seafloor-mapping Sonar, Acoustic Imaging
Navigation Sonar, Target Strength Testing
High Speed Communication
Ultrasonic Instrumentation, Sonic Cavitation Noise
20/40/60dB Gain or custom
Broadband: up to 30MHz
Low Noise, Low Power
Custom high pass filter
Built-in protection circuit

Underwater Transducer


Preamplifier: BII-1071 BII-1072 BII-1073 BII-1074 BII-1075
Gain: 20 dB 40 dB 20 dB 40 dB 60 dB
-3dB Bandwidth: 0.1 to 22 MHz 0.1 to 6 MHz 0.1 to 30 MHz 0.1 to 10 MHz 0.1 to 3 MHz
Output Type: Differential Differential Single-ended Single-ended Single-ended
Input Impedance: 20 KΩ
Input Referred Noise: 3.2nV/√Hz and 0.8pA/√Hz at 100kHz.
High Pass Filter: 1. Default:100kHz
2. Custom
Low pass filter: 1. Default: no low pass filter.
2. Custom
Note: To reduce the output noise level, the bandwidth of BII-1070 series shall be limited to be as narrow as possible.
Input Type: Differential (either single ended or differential input signals are accepted).
Input Wiring: Coated PCB: 3cm wires; Potted Unit: 0.15m Cables/Wires.
Maximum Output: 4.6 Vpp
Output Impedance: 50 Ω
Output Wiring: Coated PCB: 3cm wires; Potted Unit: 0.15m Cables/Wires.
Cable Driving Capability: 10m cable
Supply Voltage: +6 to +30 VDC
Current (Quiescent): 4.5mA
Suggested DC Supply: +9VDC Batteries, Marine Battery, Automobile Battery, Fixed DC Linear Power Supply, Not Included.
DO NOT use variable power supply whose maximum supply voltage is higher than the above rated voltage.
DO NOT use switching mode DC power supply.
Size: Coated PCB LxWxH=33x10x5mm
Potted Unit: ΦDxL = 48x25mm
Weight:  16.0 g
Operating Temperature: -40°C to 85°C
Storage Temperature: -50°C to 105°C
BII-1070 Series Wiring: Click Wiring of PCB and Potted Preamplifier
DAQ Wiring: Click DAQ Wiring for detailed wiring information to data acquisition devices.

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