Benthowave Instrument Inc.

BENTHOWAVE INSTRUMENT INC. Acoustic Transducer & System 

Transmitting Array Amplitude Shading: -40dB Sidelobes

Transmitting Array Amplitude Shading      Transmitting Array Amplitude Shading

BII-2080 Series    Array Amplitude Shading: -40dB Sidelobes

BII-2080 series is amplitude shading/weighting unit for use in sidelobe suppression of transmitting or receiving array. These low cost embedded modules support linear and planar arrays to increase the bearing accuracy and reduce ambiguity of the direction-finding sonar system.

BII-2081/2/3/4 transmitting array amplitude shading units are single input, multi-output embedded modules whose output signal levels are adjusted with amplitude shading/weighting constants and are fed to power amplifiers driving transducer array to produce transmitting beams with suppressed sidelobes (-30dB or -40dB).

A planar array of Cross shape, T shape, star shape... and a volumetric 3D array can be configured using the line array as a building block. The BII-2080 as a building block support these array patterns for sidelobes suppression.

With BII-2080s, costly multi-channel DACs are not needed for suppressing transmitting sidelobes. Sidelobe suppression at transducer material level also has much high cost and technical difficulties. BII-2080 series provide simple, low cost, real-time and accurate -30/-40 dB sidelobe suppression at analog electronic hardware level.

Suggested Application  
Direction-finding Sonar
Sub-bottom Investigation
Integrated/Embedded into Transmitting Array
Marine Animal Tracking
Seafloor-mapping System
Navigation & Obstacle Avoidance
Underwater Communication, Positioning
System Array Processing
Features:  
-30dB/-40dB Side Lobes
Low Beam Broadening Factor
Support Line, Planar and Volumetric Array
Low Cost Embedded Module
Single Power Supply
Low Power Consumption

Specification

Transmit Shading BII-2081 BII-2082 BII-2083 BII-2084
Supported Array Aperture: Line Line Rectangular Plane Rectangular Plane
Side Lobes: -30dB -40dB -30dB -40dB
Available Frequency: 10Hz to 1MHz 10Hz to 1MHz 10Hz to 1MHz 10Hz to 1MHz
Array Spacing:  ½λ ½λ ½λ ½λ
Usable Spacing: 0.5λ to 0.8λ 0.5λ to 0.8λ 0.5λ to 0.8λ 0.5λ to 0.8λ
Beam Broadening Factor: 1.13 1.31 1.13 1.31
Input        
Cable/Wire: 1. Wires (default)
2. Coax
3. Shielded cable
1. Wires (default)
2. Coax
3. Shielded cable
1. Wires (default)
2. Coax
3. Shielded cable
1. Wires (default)
2. Coax
3. Shielded cable
Connector: 1. Wire leads (Default)
2. Male BNC
3. Custom
1. Wire leads (Default)
2. Male BNC
3. Custom
1. Wire leads (Default)
2. Male BNC
3. Custom
1. Wire leads (Default)
2. Male BNC
3. Custom
Coupling: AC AC AC AC
Type: Single Ended Single Ended Single Ended Single Ended
Maximum Level: 2Vpp 2Vpp 2Vpp 2Vpp
Channel: 1 1 1 1
Impedance: 44MΩ 44MΩ 44MΩ 44MΩ
Filters: Built-in Bandpass
Specify when ordering
Built-in Bandpass
Specify when ordering
Built-in Bandpass
Specify when ordering
Built-in Bandpass
Specify when ordering
Output        
Cable/Wire: 1. Wires (default)
2. Coax
3. Shielded cable
1. Wires (default)
2. Coax
3. Shielded cable
1. Wires (default)
2. Coax
3. Shielded cable
1. Wires (default)
2. Coax
3. Shielded cable
Connector: 1. Wire leads (Default)
2. Male BNC
3. Custom
1. Wire leads (Default)
2. Male BNC
3. Custom
1. Wire leads (Default)
2. Male BNC
3. Custom
1. Wire leads (Default)
2. Male BNC
3. Custom
Coupling: AC AC AC AC
Type: Single Ended Single Ended Single Ended Single Ended
Channel:
(Array Elements)
4 to 128, Custom
Specify when ordering
4 to 128, Custom
Specify when ordering
4x4 to 16x16, Custom
Specify when ordering
4x4 to 16x16, Custom
Specify when ordering
Range: Vcc-2V Vcc-2V Vcc-2V Vcc-2V
Impedance: 10Ω 10Ω 10Ω 10Ω
Cable Drive Capability: 100m 100m 100m 100m
Miscellaneous  
Beam Steering: Not Support. Rotate array manually or mechanically.
Power Supply Vcc: 5mA/Each Channel, +12VDC to +24VDC
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 above rated voltage. DO NOT use switching mode DC power supply.
PCB Size:
(LxWxH)
50.8x37.1x6mm (8 Channel)
50.8x37.1x12mm (16 Channel)
50.8x37.1x18mm (24 Channel)
...
Potted Unit Size:
(ΦDxH)
89x10mm (8 Channel)
89x16mm (16 Channel)
89x22mm (24 Channel)
...
Mounting: 4 x ΦD1.55mm through-holes (for soldering on motherboard or mechanical fastening)
Operating Temperature: -40°C to 85°C
Storage Temperature: -50°C to 105°C

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