Benthowave Instrument Inc.

BENTHOWAVE INSTRUMENT INC. Acoustic Transducer & System 

Vector Hydrophone: Measurement of Bearing

BII-7060 series vector hydrophones (Pressure Gradient Hydrophone, Dipole Hydrophone or Quadrupole Hydrophone) are sensitive to both the amplitude and the direction of the acoustic wave in a plane, and provide cosine and sine (or orthogonal "figure 8") directivity patterns. The particle velocity can be calculated with the pressure gradient. Besides, a triaxial dipole can be set up with two BII-7060s orthogonally to overcome the ambiguity in three dimensions.

A BII-7060 consists of four sensing elements (or two orthogonal dipoles) in a plane with four outputs in a small compact size. With different wiring of the four outputs, the hydrophone can be used as a conventional omnidirectional hydrophone, a Sine and Cosine dipoles, two orthogonal dipoles or two orthogonal pressure gradient hydrophones.

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.

Furthermore , BII-7180 Series Broadband Miniature Probe Hydrophones are another options for Pressure Gradient Hydrophones.

Vector Hydrophone

BII-7060 Vector Hydrophone: Measurement of Bearing

Small Size, Sensitivity Match
Two Orthogonal Dipoles, Pressure Gradient Sensors, Quadrupole
Very Low Sensitivity to Sources Perpendicular to Dipole Axis
High Sensitivity
Support Triaxial Dipoles
Easy Setup, Portable
Particle Velocity Measurement
Underwater Tracking System
Bearing and location of underwater sound sources
Vector and Conventional Hydrophones
Related Products  
BII-1000 Hydrophone Preamplifier
BII-7070 Directional Hydrophone: Tracking the Sound Sources
BII-7550 Split Beam Transducer: Target Angle Estimation
BII-7660 Multibeam Transducer: 2D Imaging Sonar


Particle Velocity in x direction ux = - 1/(jωρ)*(аpx); ρ: Density; аpx: Pressure Gradient in the x direction.
Dipole Vector Hydrophone: Voltage Response V=M*(d/λ)*cosθ; M: Amplitude Constant related to element sensitivity; d: spacing distance between two elements; θ: Arriving angle from the axis of the two elements.
BII-7060 Series Hydrophone without Preamplifier
Vector Hydrophone BII-7061
Element Sensitivity: -187.3 (dBV/µPa)
Max. Operating Depth: 1. default: 300m
2. Deep water: 950m, Append DW to the part number.
Output Type: Single Ended Output (SE)
Cable Length: 1. 2m (default); 2. Custom: up to 5m
Cable: 1. Coax Bundle (Coax) (Default)
2. Shielded Cable Bundle (SC)
Connector: 1. Default: Wire Leads (WL)
2. BNC Male (BNC)
3. Custom (Custom)
BII-7060 Series Hydrophone with Preamplifier
Vector Hydrophone BII-7066
Element Sensitivity: -186.0 + Preamp Gain (dBV/µPa)
Preamplifier: BII-1000 Series Hydrophone Preamplifier.
1. Default: BII-1080 series preamplifier. 2. Customized: Specify when ordering.
Overload Pressure Level: 20*log(Maximum Output/2.828) - Sensitivity, (dB μPa).
Filter: Built-in, Preamplifier dependent. Specify -3dB cut-off frequency when ordering.
Max. Operating Depth: 300m
Output Type: 1. Default: Single Ended Output (SE). Append SE to the listed part number.
2. Differential Output (DF), Exclusive to preamplified hydrophone. Append DF to the listed part number.
Maximum Output: Maximum Output of the built-in preamplifier, Vpp.
Supply Voltage: +7.5 to +30 VDC, Preamplifier dependent (+4.5 to +30 VDC).
Suggested DC Supply: +9VDC Battery, 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 rated voltage.
DO NOT use switching mode DC power supply.
Current (Quiescent): Preamplifier dependent. Refer to BII-1000 Series Hydrophone Preamplifier.
Cable Length: 1. 10m (default)
2. Custom: up to 100m, hydrophone dependent.
Cable: 1. Shielded Cable Bundle (SC)
2. Wire/Cable Bundle (WCB): for use with Thru-hole Mounting ONLY.
Connector: 1. Default: Wire Leads (WL)
2. BNC Male (BNC)
3. 3.5 mm (⅛″) TRS Plug (TRS35)
4. ¼″ (6.35 mm) TRS Plug (TRS635)
5. XLR Plug (XLR)
6. Underwater Mateable Connector (UMC)
7. MIL-5015 Style (5015)
8. +9VDC Battery Snap (BS) (Exclusive to preamplified hydrophone)
9. Custom (custom)
Miscellaneous: BII-7060 Series Vector Hydrophone
Frequency Range: ≤ 30kHz, Customized, specify when ordering.
Receiving Face: Planar
Output Channel: Four Outputs from element A, B, C and D.
Spacing d: Customized, generally 8mm ≤ d << λ. d is the spacing between A and C, and between B and D.
Voltage Sensitivity: M*d/λ*cosθ and M*d/λ*sinθ for dipoles and pressure gradient sensors. Unit: V/μPa
Sensitivity Match: ± 0.3 dB V/μPa among elements A, B, C and D.
Signal Processing: Not included. Buyer shall do following signal processing at buyer's cost.
Monopole or Omnidirectional: Vo = A+B+C+D.
Dipole: Vo1=(A+B)-(C+D); Vo2=(A+D)-(B+C); Vo3=A-C; Vo4=B-D.
Pressure Gradient Sensors: Vo1=(A+B)-(C+D); Vo2=(A+D)-(B+C); Vo3=A-C; Vo4=B-D.
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 (Plastics): (BFMP)
6. Bolt Fastening Mounting (Stainless Steel): (BFMSS)
7. Thru-hole Mounting + Free Hanging (THFH)
Click Transducer and Hydrophone Mounting for more detailed information on mounting/installation.
Size (ФDxH): Determined by Operating Frequency and Spacing
Operating Temperature: -10°C to +60°C
Storage Temperature: -40°C to +60°C
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-7061 xx /xx -xx /xx -xx -xx /xx
Hydrophone Depth Rating
Blank: 300m
DW: 950m
in kHz
Spacing d
in mm
Mounting Options Cable length
in meter
Example of Part Number: Description
BII-7061/30-10-BFMP-1.0-SC-WL BII-7061 Hydrophone, 300m depth, 30kHz operating frequency, 10mm spacing, Bolt Fastening Mounting (Plastics), 1m shielded cable bundle, wire leads.
BII-7061DW/30-10-THSO-0.2-WCB-WL BII-7061 Hydrophone, 950m depth, 30kHz operating frequency, 10mm spacing, Thru-hole Mounting with Single O-ring, 0.2m wire/cable bundle, wire leads.
BII-7066 /xx /xx -xx/xx -xx /xx -xx -xx /xx
Hydrophone Operating
in kHz
in dB
High Pass or Band Pass Filter
Blank (default)
in kHz
Spacing d
in mm
Mounting Options Cable length
in meter
Example of Part Number: Description
BII-7066/30/40-10/50-10-BFMP-50-SC-WL BII-7066 Hydrophone, 300m depth, 30kHz operating frequency, 40dB Preamp Gain, 10kHz to 50kHz Band Pass Filter, 10mm spacing, Bolt Fastening Mounting (Plastics), 50m shielded cable bundle, wire leads.
BII-7066/30/40-10-10-BFMP-50-SC-WL BII-7066 Hydrophone, 300m depth, 30kHz operating frequency, 40dB Preamp Gain, 10kHz High Pass Filter, 10mm spacing, Bolt Fastening Mounting (Plastics), 50m shielded cable bundle, wire leads.
BII-7061 & BII-7066 Dipole Directivity (A-C or B-D) BII-7061 & BII-7066 Hydrophone Structure
vector hydrophone  vector hydrophone 
Bespoke Dipoles in XY Plane Bespoke Dipoles in 3D
Vector Hydrophone Vector Hydrophone

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