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

Features
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
Applications  
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

Specifications

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.
Vector Hydrophone BII-7060
Frequency Range: ≤ 30kHz, Customized, specify when ordering.
Receiving Face: Cylindrical
Output Channel: Four Outputs from element A, B, C and D.
Output Type: Single Ended Output (SE) for each element of 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.
Max. Operating Depth: 1. default: 300m
2. Deep water: 950m, Append DW to the part number.
Mounting Options: 1. Free Hanging (FH)
2. Default, Bolt Fastening Mounting (Plastics): (BFMP)
3. Bolt Fastening Mounting (Stainless Steel): (BFMSS)

4. Thru-hole Mounting with Single O-ring (THSO)
5. Thru-hole Mounting with Double O-ring (THDO)
6. End-face Mounting:  (EFM)
Click Transducer and Hydrophone Mounting for more detailed information on mounting/installation.
Cable Length: 1. 1m (default)
2. Custom: up to 100m, hydrophone dependent.
Cable: 1. Two Shielded Cable (SC)
2. Wire/Cable Bundle (WCB): for use with Thru-hole Mounting ONLY.
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. Underwater Mateable Connector (UMC)
6. MIL-5015 Style (5015)
7. Custom (Custom)
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-7060 xx /xx -xx /xx -xx -xx /xx
Hydrophone Depth Rating Blank: 300m
DW: 950m
Operating Frequency
in kHz
Spacing d
in mm
Mounting Options Cable length
in meter
Cable Type Connector
Example of Part Number: Description
BII-7060/30-10-BFMP-1.0-SC-WL BII-7060 Hydrophone, 300m depth, 30kHz operating frequency, 10mm spacing, Bolt Fastening Mounting (Plastics), 1m shielded cable, wire leads.
BII-7060DW/30-10-THSO-0.2-WCB-WL BII-7060 Hydrophone, 950m depth, 30kHz operating frequency, 10mm spacing, Thru-hole Mounting with Single O-ring, 0.2m wire/cable bundle, wire leads.
Dipole Directivity Hydrophone Structure
vector hydrophone Vector Hydrophone

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