BENTHOWAVE INSTRUMENT INC. Acoustic Transducer & System
BII-7060 series vector hydrophones are planar or 3D discrete arrays
consisting of Pressure Gradient Hydrophones or Dipole
Hydrophones: Quadrupole Hydrophone Array, Tetrahedron Array and
Triaxial Dipole Array. They are sensitive to both the amplitude and the
direction of the acoustic wave in a plane,
provide cosine and sine (or orthogonal "figure 8") directivity patterns
in dipole plane. Depending on complex weighting of each element,
different directional beam patterns can be implemented such as
cardioid and endfire.
The particle
velocity can be calculated with the pressure gradient.
Besides, a triaxial dipole can be set up with
two planar array orthogonally to overcome the ambiguity in three
dimensions.
BII-7061 and BII-7066 consist 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.
Typical 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)*(аp/аx);
ρ: Density; аp/аx:
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 | BII-7062 | BII-7063 |
Element Sensitivity: | -187.3 (dBV/µPa) | -223.0 (dBV/µPa) | -223.0 (dBV/µPa) |
Element Aperture: | Planar | Omnidirectional | Omnidirectional |
Array Structure: | Planar | Two Dimensional | Three Dimensional |
Output Type: | Single Ended Output (SE) |
BII-7060 Series Hydrophone with Preamplifier |
Vector Hydrophone | BII-7066 | BII-7067 | BII-7068 |
Structure: | BII-7061 + Preamplifiers | BII-7062 + Preamplifiers | BII-7063 + Preamplifiers |
Preamplifier: |
Refer to
Preamp Info. Each element has a preamplifier. All preamplifiers are in water-proofed housing. |
Miscellaneous: Vector Hydrophone |
Operating Depth: | 300m, Maximum |
Frequency Range: | ≤ 30kHz, Customized, specify when ordering. |
Receiving Face: | Planar |
Output Channel: | Each array element has a output. |
Spacing d: |
Customized, generally 8mm ≤ d << λ ≤ 150mm. d is the spacing
among array element. If spacing > 150mm, Please consider discrete hydrophones as array element. |
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. |
Signal Processing: | Not included. Buyer shall do following signal processing
at buyer's cost. Following example fits for BII-7061, BII-7062, BII-7066, BII-7077. 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. |
Size (ФDxH): | Determined by Operating Frequency and Spacing |
Information: | Acoustic Components and System: Installation/Mounting, Ordering, Wiring, Array & Aperture Design and much more. |
How to order
If the default parameter stated in the specs is to be ordered, please ignore that parameter or use blank.
P/N | /f | -xx | /xx | -xx | -xx | /xx |
Part Number | Operating
Frequency in kHz |
Spacing d in mm |
Mounting Options | Cable
length in meter |
Cable Type | Connector |
Example of Part Number: | Description |
BII-7061/30kHz-10mm-FGM-1.0m-SC-WL | BII-7061 Hydrophone, 30kHz operating frequency, 10mm spacing, Flange Mounting (Plastics), 1m shielded cable bundle, wire leads. |
P/N | /f | /xx | -xx/xx | -d | /xx | -xx | -xx | /xx |
Part Number | Frequency in kHz |
Preamp
Gain in dB |
Band Pass Filter in kHz |
Spacing in mm |
Mounting Options | Cable
length in meter |
Cable Type |
Connector |
Example of Part Number: | Description |
BII-7066/30kHz/40dB-10kHz/50kHz-10mm-FGM-50m-SC-WL | BII-7066 Hydrophone, 30kHz operating frequency, 40dB Preamp Gain, 10kHz to 50kHz Band Pass Filter, 10mm spacing, Flange 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 |