Benthowave Instrument Inc.

BENTHOWAVE INSTRUMENT INC. Acoustic Transducer & System 

Measurement Transducer

BII-7750 Measurement Transducer - Hydrophone Calibration

BII-7750 series measurement transducers are circular piston transducers which generate uniform plane-wave near-fields along the acoustic axis in a specific low frequency range, and are reciprocal in audio and ultrasonic frequency range.

With BII-7750's uniform near-field, hydrophones' sensitivity can be calibrated quickly in field, and hydrophone calibration can be carried out in a much smaller body of water comparing to conventional far-filed measurement.

BII-7750 series can be used as standard projectors to calibrate hydrophones or as unknown projectors to support comparison calibration of hydrophones in near-field or far field.

Optional mounting parts are available for installation on portable-mounting apparatus, submersibles, pipe, tank or vessel.

Reciprocity Calibration

Suggested Application  
Hydrophone Calibration in Near-field
Reciprocity Calibration in Audio and Ultrasonic Frequency Range
Quality Control Measurement R & D Measurement in Laboratory
Uniform Plane-wave Near-field Reciprocal Transducer up to 80kHz
Related Products
BII-5000 Wideband Power Amplifier BII-8030 Acoustic Transmitter


Note: Near-field is in front of the transducer radiation surface and is along the acoustic axis normal to the radiation surface.
Transducer BII-7751
Frequency: Near-field Use: 1 to 15 kHz; Far-field Use: ≤ 80kHz.
Uniform Near-field: ±0.5dB Pressure Tolerance: Φ70x80mm;
±1dB Pressure Tolerance: Φ80x100mm.
DUT Size: Near-field Use: DUT Diameter ≤ Φ30mm. DUT: Device Under Test.
Far-field Use: No limitation.
Beam Pattern: Conical in far-field.
-3dB Beam Width: 570°/f  at f > 18kHz.     f: Operating Frequency in kHz.
Side Lobes: No Side Lobe when operating frequency ≤ 18kHz.
Maximum Operating Depth: 50m
Maximum Driving Voltage: 50Vrms
Driving Current (mA): 0.885*f*Vrms.    f: operating frequency in kHz; Vrms: driving voltage in RMS Volt.
Mounting Options: 1. Default: Free Hanging (FH)
2. Free-hanging with Male Underwater Connector (FHUWC)

3. Thru-hole Mounting with Single O-ring (THSO)
4. Thru-hole Mounting with Double O-ring (THDO)
5. Bolt Fastening Mounting (Stainless Steel): (BFMSS)
6. End-face Mounting:  (EFM)
7. Flange Mounting: (FGM)
Transducer and Hydrophone Mounting for more detailed information on mounting/installation.
Cable: 1. Shielded cable (SC)
2. 50Ω RG58 Coax (RG58)
Connector: 1. Default: Wire Leads (WL)
2. 50Ω BNC Male
3. Underwater Mateable Connector (UMC)
4. MIL-5015 Style (5015)
5. Custom (Custom)
Size: ΦDxH = Φ168x30 mm
Operating Temperature: -10°C to +60°C
Storage Temperature: -40°C to +60°C
How to Order: Click How to Order.
Transducer Wiring: Click Transducer Wiring for detailed wiring information.

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