Benthowave Instrument Inc.

BENTHOWAVE INSTRUMENT INC. Acoustic Transducer & System 

Split Beam Transducer: Target Angle Estimation

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BII-7550 Split Beam Transducer: Target Angle Estimation

Four-quadrant split beam transducers of BII-7550 series are designed to estimate bearing and locate underwater targets, and support phase extraction or amplitude comparison methods to measure the bearing of the sound sources. That which method is used depends on the signal processing in software/electronic hardware and the signal properties.

BII-7550 transducers can also be used as fishery sounders and sea-floor mapping transducers by wiring 4 sectors together in parallel for transmitting sounds and receiving sounds.

Technical Notes

The quadrant array is separately beam formed. The signals from the direction (Ψ, Φ) will result in the phase contributions to the single-frequency directivity patterns functions of the array. With signal processing technologies, the spatial angle (Ψ, Φ), which can be computed quantitatively, indicates the target direction.

Application Features Related Products

Direction-finding Sonar
Measurement of Bearing
Split-Aperture Correlator
Underwater Positioning
Tracking Moving Target
Fishery Acoustics, Marine Life Assessment

Four Quadrants
Broad Bandwidth, Low Q
Low Sidelobes
Easy Mounting
Custom Receiving &Transmitting Beam
Custom Design

BII-1005 Ultrasonic Preamplifier
BII-5000 Power Amplifier
BII-6000 Impedance Matching and Tuning Unit
BII-8030 Underwater Acoustic Transmitter
BII-8080 Transmitting and Receiving System
Sonar Signal Generation

Specification

Split Beam Transducer Split Beam TransducerSplit Beam TransducerSplit Beam TransducerFlange MountSplit Beam TransducerFlush Mounting
Array Pattern: Transmitting: A+B+C+D in parallel, Conical Beam
Receiving: Sector A, B, C, D, Four Quadrants, Split Beams
BII-7550 Transducer: BII-7551 BII-7552 BII-7552/5 BII-7552/6 BII-7553 BII-7554 BII-7555
Center Frequency: 38 kHz 70 kHz 70 kHz 70 kHz 120 kHz 200 kHz 420 kHz
Quality Factor Q: 3.5 3.2 3.2 3.2 3.3 3.2 3.6
Transmitting Beam Angle: 14.8° 12° 10° 9.5° 8.5°
Transmit Beam Pattern: Conical Conical Conical Conical Conical Conical Conical
TVR (dB µPa/V@1m): 164 163.1 168.5 170.0 165.6 176 179
Receiving Array: Four Quadrants Four Quadrants Four Quadrants Four Quadrants Four Quadrants Four Quadrants Four Quadrants
OCV (dB V/µPa): -176 -173.2 -173.2 -173.2 -179.4 -195 -200
Angle Sensitivity:
Phase Shift/Spatial Angle
10.4 12.7 15.8 19.0 16.4 18.5 26.1
Two-way Sidelobes: ≤-35 dB ≤-35 dB ≤-35 dB ≤-35 dB ≤-35 dB ≤-35 dB ≤-35 dB
Maximum Drive Voltage: 600Vrms 600Vrms 600Vrms 600Vrms 600Vrms 600Vrms 600Vrms
Size (ΦDxH mm): 168x60 114x50 141x50 168x50 89x36 60x35 42x30
Impedance Matching: Custom BII-6000: 4 to 16Ω, 50Ω, 75Ω, 100Ω,..., order separately.
BII does not integrate BII-6000 into the housing of BII-7550 series transducer.
Maximum Depth: 100m
Mounting Options: 1. Default: Free Hanging (FH)
2. Thru-hole Mounting with Single O-ring (THSO)
3. Thru-hole Mounting with Double O-ring (THDO)
4. Bolt Fastening Mounting (Stainless Steel): (BFMSS)
5. End-face Mounting:  (EFM)
6. Flange Mounting: (FGM)
Click
Transducer and Hydrophone Mounting for more detailed information on mounting/installation.
Cable: 1. Shielded Cable (SC)
2. Wire/Cable Bundle (WCB): for Thru-hole Mounting and End-face Mounting
Connector: 1. Default: Wire Leads (WL)
2. Underwater Mateable Connectors (UMC)
3. MIL-5015 Style (5015)
4. Custom (custom)
Operating Temperature: -10°C to +60°C
Storage Temperature: -40°C to +60°C
How to Order: Click How to Order.

Array Position

Split Beam Transducer       Split Beam Transducer      Split Beam Transducer

Transducer Wiring

Two Shielded Cable (Free Hanging and Flange Mounting) Signal
Red Wire of Cable label “I” Sector A +
Black Wire of Cable label “I” Sector A -
White Wire of Cable label “I” Sector B +
Blue Wire of Cable label “I” Sector B -
Shield of Cable label “I” System Grounding for Safety
Red Wire of Cable label “2” Sector C +
Black Wire of Cable label “2” Sector C -
White Wire of Cable label “2” Sector D +
Blue Wire of Cable label “2" Sector D -
Shield of Cable label “2” System Grounding for Safety
   
Coax Cable: Receiving ONLY (Thru-hole Mounting) Signal
Conductor of Coax Cable, label “I” Sector A +
Shield of Coax Cable, label “I” Sector A -
Conductor of Coax Cable, label “2” Sector B +
Shield of Coax Cable, label “2” Sector B -
Conductor of Coax Cable, label “3” Sector C +
Shield of Coax Cable, label “3” Sector C -
Conductor of Coax Cable, label “4” Sector D +
Shield of Coax Cable, label “4” Sector D -
   
Wire/Cable Bunble: (Thru-hole and End-face Mounting) Signal
Red Wire Sector A +
Green Wire Sector A -
Orange Wire Sector B +
Yellow Wire Sector B -
Brown Wire Sector C +
Blue Wire Sector C -
White Wire Sector D +
Black Wire Sector D -
   
Shielded Cable: (Bolt Fastening Mounting) Signal
Red Wire Sector A +
Green Wire Sector A -
Orange Wire Sector B +
Yellow Wire Sector B -
Brown Wire Sector C +
Blue Wire Sector C -
White Wire Sector D +
Black Wire Sector D -
Shield System Grounding for Safety

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