Benthowave Instrument Inc.

BENTHOWAVE INSTRUMENT INC. Acoustic Transducer & System 

Receiving Array Amplitude Shading: -40dB Sidelobes

Transmitting Array Amplitude Shading      Transmitting Array Amplitude Shading

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

BII-2080 series is amplitude shading/weighting unit for use in side-lobe 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-2085/6/7/8 receiving array amplitude shading units are multi-input, single output embedded modules whose input signal levels are adjusted with amplitude shading/weighting constants, and the summation output is fed to a waveform display device. The receiving beams features suppressed side-lobes (-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 simultaneous sampling ADCs are not needed for suppressing receiving sidelobes. Sidelobe suppression at transducer material level also has much high cost and technical difficulties. BII-2080 series provides simple, low cost, real-time and accurate -30/-40 dB sidelobe suppression at analog electronic hardware level.

Suggested Application  
Integrated/Embedded into Receiving Array
Tracking of Underwater Sound Sources
Pinger Locating, Acoustic Tag Tracking
Bioacoustics
Marine Animal Tracking
Direction-finding Sonar
Sub-bottom Investigation
Seafloor-mapping System
Navigation & Obstacle Avoidance
Underwater Communication, Positioning
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
Related Products  
BII-8040 Underwater Acoustic Receiver Filtering-SUM Beamformer with built-in amplitude shading

Specification

Receive Shading BII-2085 BII-2086 BII-2087 BII-2088
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
Beam Broadening Factor: 1.13 1.31 1.13 1.31
Usable Spacing: 0.5λ to 0.8λ 0.5λ to 0.8λ 0.5λ to 0.8λ 0.5λ to 0.8λ
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: Differential Differential Differential Differential
Gain: 0dB, Default
0 to 40dB, Custom
0dB, Default
0 to 40dB, Custom
0dB, Default
0 to 40dB, Custom
0dB, Default
0 to 40dB, Custom
Maximum Level: 2.8Vpp 2.8Vpp 2.8Vpp 2.8Vpp
Channel:
(Array Elements)
4 to 128
Specify when ordering
4 to 128
Specify when ordering
4x4 to 16x16
Specify when ordering
4x4 to 16x16
Specify when ordering
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: 1 1 1 1
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.
Waveform Display Device: Handheld Oscilloscopes, Computerized Digitizer, Computer+DAQ, Not Included
Power Supply Vcc: 0.6mA/Each Channel+6.0mA, +7VDC to +30VDC
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

Wiring and PCB Layout

Array Amplitude ShadingArray Amplitude Shading

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