Benthowave Instrument Inc.

BENTHOWAVE INSTRUMENT INC. Acoustic Transducer & System 

Vector Hydrophone: Measurement of Bearing

Vector HydrophonePressure Gradient Hydrophonevector hydrophonevector hydrophone

BII-7060 series vector hydrophones (Pressure Gradient Hydrophone or Dipole Hydrophone) are sensitive to both the amplitude and the direction of the acoustic wave, and provide cosine or "figure 8" directivity patterns. The particle velocity can be calculated with the gradient of the pressure. Besides, biaxial dipole and triaxial dipole can be set up with multiple BII-7060s.

BII vector hydrophones consist of two elements (or two identical hydrophones) with small probes and one signal processing unit. The small probes cause little disturbances to the sound field under test.

Several mounting options are available to the elements, which support installation on portable mounting apparatus and the wall/hull of underwater submersibles, pipes, tanks, vessels and instrument housing.

Vector Hydrophone

BII-7060 Vector Hydrophone: Measurement of Bearing


Small Probe Size, Sensitivity Match.
Low power consumption, battery-powered
Very low sensitivity to sources perpendicular to dipole axis

High Sensitivity
Support biaxial or triaxial Dipoles
Easy setup, portable

Applications Related Products

Particle Velocity Measurement
Dipole, Biaxial or Triaxial Dipoles
Bearing and location of underwater sound sources

BII-7070 Directional Hydrophone: Tracking the Sound Sources
BII-7550 Split Beam Transducer: Target Angle Estimation
BII-7660 Multibeam Transducer: 2D Imaging Sonar


Vector Hydrophone BII-7061 BII-7062 BII-7063 BII-7064
Operating Frequency: 1Hz to 5kHz 1Hz to 5kHz 1Hz to 10kHz 1Hz to 10kHz
Structure Dipole Dipole Dipole Dipole
Voltage Sensitivity (V/Pa): 0.291*d/λ*cosθ 0.0291*d/λ*cosθ 0.2033*d/λ*cosθ 0.02033*d/λ*cosθ
Probe Size (ФDxH): Ф6x5mm Ф6x5mm Ф4x3mm Ф4x3mm
Element Size (ФDxH): Ф26.5x75mm Ф26.5x75mm Ф26.5x75mm Ф26.5x75mm
Spacing d: Set up by operator, generally d << λ.
Bandpass Pass Filter: 1. Default: no band pass filter
2. Built-in, Customized.
Note: BII does NOT provide any supportive fixture, frame and portable mounting apparatus.
PVC or plastic materials is recommended to make supportive fixture/frame for mounting hydrophones.
Element Properties:  
Max. Operating Depth: 300m
Quantity: Two
Sensitivity Match: ± 0.15 dB V/uPa
Mounting Options: 1. Default, Bolt Fastening Mounting (Plastics): (BFMP)
2. Bolt Fastening Mounting (Stainless Steel): (BFMSS)

3. Thru-hole Mounting with Single O-ring (THSO)
4. Thru-hole Mounting with Double O-ring (THDO)
Click Transducer and Hydrophone Mounting for more detailed information on mounting/installation.
Cable Length: 1. 10m (default)
2. Custom: up to 100m
Cable: 1. Shielded Cable (SC)
2. Wire/Cable Bundle (WCB): for use with Thru-hole Mounting ONLY.
Connector: MIL-5015 Style (5015), Pin Contact.
Signal Processing Unit In short: SPU
Application: For use in air ONLY, not for underwater use.
Input Connector: Two, MIL-5015 Style (5015), Socket Contact.
Input cable: Two, Shielded Cable.
Input Cable Length: 0.15m/each cable
Output Type: Single Ended Output (SE).
Output Cable Length: 1. 0.15m (default)
2. Custom
Output Connector: 1. Default: Wire Leads (WL)
2. 3.5 mm (⅛″) TRS Plug (TRS35)
3. ¼″ (6.35 mm) TRS Plug (TRS635)
4. XLR Plug (XLR)
5. MIL-5015 Style (5015), Pin Contact.
6. Custom Connector (custom)
Power Supply: +8.5 to +24 VDC
Current (Quiescent): 11 mA
Power Supply Cable Length: 1. 0.1m (default)
2. Custom
Power Supply Connector: 1. Default: Wire Leads (WL)
2. +9VDC Battery Snap (BS)
Operating Temperature: -10°C to +60°C
Storage Temperature: -40°C to +60°C
How to Order: Each vector hydrophone includes two elements and one signal processing unit.
To set up biaxial dipole/vector array, two vector hydrophones shall be ordered.
To set up triaxial dipole/vector array, three vector hydrophones shall be ordered.
Hydrophone Wiring: Click Hydrophone Wiring for detailed wiring information.

How to order

If the default parameter stated in the specs is to be ordered, please ignore that parameter or use blank.

BII-706x -xx -xx /xx -xx -xx /xx -xx /xx -xx
Hydrophone High Pass Filter
Blank (default)
in kHz
Low Pass Filter
Blank (default)
in kHz
Element cable
in meter
Element cable SPU output cable length
in meter
SPU Output
Power Supply
cable length
in meter
Power supply
Example of Part Number: Description
BII-7061-0.1-1.0/BFMP-10.0-SC/1.0-WL/0.15-BS BII-7061 Hydrophone, 0.1kHz high pass filter, 1kHz low pass filter, Bolt Fastening Mounting (Plastics), 10m shielded cable, 1m SPU output cable, wire leads, 0.15m power supply cable, +9VDC Battery Snap.
BII-7061-0.1-1.0/THSO-0.15-WCB/0.15-WL/0.15-WL BII-7061 Hydrophone, 0.1kHz high pass filter, 1kHz low pass filter, Thru-hole Mounting with Single O-ring, 0.15m Wire/Cable Bundle, 0.15m SPU output cable, wire leads, 0.15m power supply cable, wire leads.
Directivity Element Structure
vector hydrophone Vector Hydrophone

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