Benthowave Instrument Inc.

BENTHOWAVE INSTRUMENT INC. Acoustic Transducer & System 

Transducer Array Element: 24 to 100 kHz

Transducer Array ElementTransducer Array ElementTransducer Array ElementTransducer Array ElementTransducer Array ElementTransducer Array Element

BII-7600   Transducer Array Element: 24 to 100 kHz

Bbroadband array elements in BII-7600 series are designed for uses in line, plane, curved, conformal and parametric array, which meet the requirements of many underwater acoustic systems: vehicle/robot navigation, fishery sounding, bathymetric sounding, communication, marine animal study, physical oceanography research, seabed penetration/investigation etc...
Besides, BII-7600 series transducer can also be used as a stand-alone transducer for transmitting and/or receiving sounds underwater.

Depending on the operating frequency (transmitting or receiving), these array elements can be treated as point, circular or rectangle aperture in array signal processing. Array beamforming (weighting/shading and beam steering) and the configuration of array pattern/factor are much easier to be implemented in the arrays consisting of BII-7600s. Its aperture is rectangle to meet the interelement spacing limits (≤½λ or ≤λ). With thru-hole/hull or bolt-fastening mounting, BII-7600s can be installed quickly and easily on apparatus of an array pattern.

Customized array can be achieved with multiple BII-7600s: parametric, acoustic sweeping (sector/2D/3D scanning), direction-finding, multi-beam, target angle estimation (Measurement of Bearing), dual-frequency, dual-beam, reduced beam width, wide beam width, side-lobe suppression, amplitude shading, higher radiation power, split beam Target-Angle-Estimation System, etc...

In specific field conditions, sidelobes of transmitting transducers cause spurious echoes from uninterested directions, sidelobes of receiving transducers result in spurious sources' sounds from uninterested directions as well. BII-7600s are a suitable candidate for use in these underwater systems in which sidelobes' effect is intolerable.

Besides being used in active Sonar, multiple BII-7600s can also be used in passive Sonar (listening sounds ONLY).

Optional mounting parts are available for installation on portable-mounting apparatus, submersibles, pipe, tank or vessel.
An impedance matching transformer is optional to provide correct impedance match to load requirements of power amplifiers.
A Transmit & Receive Switch is available to be integrated inside transducer for amplifying the received sounds and driving long cable.

Technical Notes:
Bandwidth = fr/Q.  Q: Quality Factor of the Transducer. 
Array directivity function = (directivity function of array element) * (directivity function of array pattern).

Line ArrayCross Line ArrayPlane ArraySector ArrayCircular Array

Suggested Application  
Array Elements or Stand-alone Transducer
General purpose Projector
General purpose hydrophone
Long Range Echo Sounding
Direction-finding/Target-Angle-Estimation
Marine animal survey and assessment
Navigation, Obstacle Avoidance
Underwater Communication, Acoustic Positioning
Sub-Bottom Investigation/Assessment/Profiler
Fishing Sounder, Survey Bioacoustics, Marine Animal Behavior Study
Tracking/searching/locating marker/pinger/beacon/positioning
Bathymetry, Distance Gage, Altimeter, Sea Level Monitoring
Features  
Broadband, Low Q, No Side Lobes
Small Size to meet spacing limit of the array
Easy mounting/Installation
Customized Beam Width and Frequency
Related Products  
BII-2100 Transmitting & Receiving Switch
BII-5000 Power Amplifier
BII-6000 Impedance Matching and Tuning Unit
BII-4000 Signal Generation
BII-8030 Underwater Acoustic Transmitter
BII-8080 Transmitting and Receiving System

Specification

Receiving Sensitivity Loss over Extension Cable (dB) = 20*log[Ch/(Ch+Cc)];
Ch - Receiving Transducer Capacitance; Cc - Extension Cable Capacitance. Generally, Cc = 70 to 120 pF/meter.
The TVR of the transducer is NOT affected with the cable length.
Transducer fr
(kHz)
Q Aperture
ΦD
TVR
μPa/V@1m
OCV (V/μPa)
without cable
Beam
Angle
Capacitance
without cable
Depth
Rating
Deep
Water
Size (mm)
ΦDxH
Weight
(kg)
BII-7601 24 3 40mm 120.0dB -171.0dB 95º 90pF 100m 950m 48x85 1.0
BII-7601/50 24 3 77mm 131.2dB -171.0dB 50º 340pF 100m 950m 89x85 2.0
BII-7602 28 3 35mm 121.0dB -172.0dB 90º 63pF 100m 950m 42x75 0.8
BII-7602/50 28 3 62mm 131.0dB -172.0dB 50º 200pF 100m 950m 73x75 1.5
BII-7603 38 3 26mm 125.0dB -174.0dB 90º 80pF 100m 950m 33x60 0.6
BII-7603/50 38 3 52mm 137.0dB -174.0dB 50º 320pF 100m 950m 60x60 0.8
BII-7604 50 3 21mm 128.7dB -169.0dB 85º 77pF 100m 950m 27x50 0.3
BII-7604/50 50 3 40mm 140.9dB -169.0dB 50º 310pF 100m 950m 48x50 0.5
BII-7605 70 3 15mm 127.6dB -173.6dB 92º 75pF 100m 950m 21x40 0.2
BII-7605/50 70 3 26mm 137.0dB -173.6dB 50º 225pF 100m 950m 33x40 0.3
BII-7606 100 3 21mm 135.0dB -187.3dB 50º 100pF 100m 950m 27x30 0.1
Beam Pattern: Conical
Side Lobe: No Side Lobe
Maximum Drive Voltage: 600Vrms
Deep Water: To order Deep Water model, append DW to the part number.
For example, BII-7604DW is of 950m depth rating; BII-7604 is of 100m depth rating.
Impedance Matching: Custom BII-6000: 4 to 8Ω, 50Ω, 60Ω, 100Ω,...; Not Included. Order Separately, Append IM to part number.
T/R Switch:  BII-2100 Transmitting & Receiving Switch; Not included, order separately, Append TR to part number.
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)
Click
Transducer and Hydrophone Mounting for more detailed information on mounting/installation.
Cable Length: 1. default: 0.1m
2. custom
Cable: 1. Shielded Cable (SC)
2.  Wire/Cable Bundle (WCB): ONLY for Thru-hole Mount with BII-760xTR and BII-760xTRIM.
Connector Options: 1. Default: Wire Leads (WL)
2. Underwater Mateable Connector (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.
Transducer Wiring: Click Transducer Wiring for detailed wiring information.
Transmitting Array: Array & Aperture Design

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