Benthowave Instrument Inc.

BENTHOWAVE INSTRUMENT INC. Acoustic Transducer & System 

High Power Broadband Piston Transducer

Piston TransducerPiston TransducerPiston TransducerPiston TransducerPiston Transducer

BII-7500s are high power broadband piston transducers (Tonpilz, Langevin, Sandwich, Transmission Line) with conical beams, which have no sidelobes below 50kHz. These transducers are designed for use in echosounding, sub-bottom profiling, communication, navigation, positioning, fishery, bioacoustics ...

Customized array can be achieved with multiple BII-7500s: parametric array, direction-finding Sonar, multi-beam Sonar, dual-frequency transducers, dual beam transducers, reduced beam width, side-lobe suppression/amplitude shading, higher radiation power, etc... For example, a 0.445m x 0.445m square array can be set up with 25 BII-7504/3.5 to achieve 3.5kHz high power sound of 49º beam width, which can penetrate sediments deeper than 20 meters. After current field project is done, these array elements can be assembled into different array patterns in next project.

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.

Attenuation/absorption coefficient of sediments is frequency dependent around 0.06f to 0.6f (dB/(m*kHz)).
Bandwidth = fr/Q
.  Q: Quality Factor of the Transducer.
TVR of BII-7500 Series Planar Array =
TVR of Single BII-7500 Series Transducer + 20*log N;  N - Quantity of the Array Element.
One-way Configuration:
Transmission or Reception.
Two-way Configuration:
Transmission and Reception. Transmit & Receive switch BII-2100 is available from BII.

BII-7500   High Power Broadband Piston Transducer

Suggested Application  
Parametric, Linear, Planar & Cylindrical Array
Fixed Array & Drifting Array
Seabed Penetration/Sediment Profiler/Sub-bottom Profiling
Direction-finding Sonar/Multi-beam Sonar
Artificial Acoustic Target
Echo-Repeater Target, Active-Acoustic Target
Projector Array in Multibeam Sonar System
Echosounding, Navigation, Obstacle Avoidance
Underwater Robotic and Vehicle (ROV, AUV, UUV)
Long Rang Transmission
Pinger/Locator/Transponder/Acoustic Positioning/Tracking
Underwater Communication and Telephone
Fishery Sonar, Bioacoustics, Marine Animal Behavior Research
Acoustic Deterrent to Marine Animals, Bioacoustic Stimuli
Frequency Range: 1 to 100 kHz
High Power
Broadband, Low Qm
Conical Beam, No side lobes or <-17.7dB
Related Products  
BII-7560 Echosounding Transducer
BII-2100 Transmitting & Receiving Switch
BII-5000 Power Amplifier
BII-6000 Impedance Matching and Tuning
BII-7730 High Power Broadband Transducer: 10 to 200 kHz
BII-8030 Underwater Acoustic Transmitter
BII-8080 Transmitting & Receiving System
Sonar Signal Generation


Note: -3dB Beam Width: BW1°/BW2º, the BW1° is one-way beam width, the BW2°  is two-way beam width.
TVR unit: dB µPa/V@1m; OCV unit: dB V/µPa.
Transducer Frequency
TVR OCV Beam Width
Q Maximum
Input Power
BII-7501/50 50
TVR OCV 46°/33º
80W 300m 500m 48x65 0.5
BII-7501/60 60 148.0 -190.0 49°/35.3º 5 60W 300m 500m 42x60 0.4
BII-7502/22 22 141.8 -178.0 90°/64º 6 230W 300m 400m 60x110 1.1
BII-7502/28 28 144.0 -178.0 70°/50º 6 160W 300m 400m 60x75 0.9
BII-7502/38 38 146.6 -182.0 50°/37º 5 160W 300m 400m 60x75 0.9
BII-7503/3.5 3.5 130.5 -180.0 180°/180º 5 500W 100m 300m 89x200 3
BII-7503/5 5
TVR OCV 180°/180º
5 400W 100m 300m 89x144 2.4
BII-7503/6 6 TVR OCV 180°/180º 4 1000W 100m 300m 89x144 2.5
BII-7503/9 9 TVR OCV 140°/100º 4 800W 100m 300m 89x122 2.2
BII-7503/12 12 141.6 -182.0 105°/76º 5 1500W 100m 300m 89x122 2.0
BII-7503/16 16 144.0 -182.0 78°/56º 5 3000W 100m 300m 89x122 2.5
BII-7503/20 20 TVR OCV 63°/45º 5 1400W 100m 300m 89x110 1.8
BII-7503/25 25 146.0 -187.0 50°/36º 5 2500W 100m 300m 89x110 1.6
BII-7503/60 60 158.0 -187.0 20°/15º 5 240W 100m 300m 89x50 2.0
BII-7504/22 22 152.3 -178.0 39°/27.8º 6 700W 50m N/A 114x106 5.0
BII-7504/28 28 154.4 -178.0 30.5°/21.8º 6 500W 50m N/A 114x95 4.0
BII-7504/38 38 157.0 -182.0 22.5°/16.2º 5 500W 50m N/A 114x70 3.5
BII-7504/50 50 159.5 -184.0 17.2º/12.5º 3 320W 50m N/A 114x55 3.0
BII-7504/60 60 161.0 -186.0 14.5°/10.6º 5 400W 50m N/A 114x50 3.0
BII-7505/22 22 154.7 -178.0 31.2°/22.3º 6 1100W 50m N/A 141x106 6.0
BII-7505/28 28 158.8 -178.0 24.5°/17.5º 6 800W 50m N/A 141x95 5.2
BII-7505/38 38 159.5 -182.0 18°/13º 5 800W 50m N/A 141x70 4.6
BII-7505/50 50 161.9 -184.0 13.8º/10.0º 3 550W 50m N/A 141x55 3.7
BII-7505/60 60 163.0 -186.0 11.5°/8.5º 5 650W 50m N/A 141x50 3.5
BII-7506/22 22 156.3 -178.0 26°/18.6º 6 1600W 50m N/A 168x106 7.6
BII-7506/28 28 158.4 -178.0 20.4°/14.6º 6 1100W 50m N/A 168x95 6.6
BII-7506/38 38 161.0 -182.0 15°/10.8º 5 1100W 50m N/A 168x70 5.8
BII-7506/50 50 163.0 -184.0 11.5º/8.2º 3 800W 50m N/A 168x55 5.0
BII-7506/60 60 165.0 -186.0 9.6°/7.0º 5 1000W 50m N/A 168x50 4.6
Beam Pattern: Conical
Side lobes: If -3dB one-way beam width ≥ 49°, No side lobes;  if -3dB one-way beam width < 49°, Side lobe level < -17.7 dB.
Driving Voltage: 600Vrms Maximum.
Duty Cycle: 1% at Maximum Power or Maximum Driving Voltage.
Temperature Sensor: 1. Default: No built-in temperature sensor.
2. Built-in NTC thermistor. When ordering, append TS to part number for integrating NTC thermistor in transducers.
Deep Water: To order Deep Water model, append DW to the part number.
For example, BII-7503DW is of 300m depth rating; BII-7503 is of 100m depth rating.
Impedance Matching: BII-6000, Not included. Order separately, append IM to part number.
Customized to optimum load of the power amplifier: 4Ω to 16Ω, 50Ω, 75Ω, 100Ω, etc...
TR Switch: BII-2100 Transmitting & Receiving Switch. Not Included. Order Separately, Append TR to part number.
Mounting Options: 1. Default: Free Hanging (FH)
2. Free-hanging with Male Underwater Connector (FHUWC)

3. Thru-hole Mounting with Single O-ring (THSO)
4. Thru-hole Mounting with Double O-ring (THDO)
5. Bolt Fastening Mounting (Stainless Steel): (BFMSS)
6. End-face Mounting: (EFM)
Transducer and Hydrophone Mounting for more detailed information on mounting/installation.
Cable: 1. Shielded Cable (SC)
2. Wire/Cable Bundle (WCB): ONLY for Thru-hole Mounting with BII-750xTR and BII-750xTRIM.
Connector: 1. Default: Wire Leads (WL)
2. Underwater Mateable Connector (UMC)
3. MIL-5015 Style (5015)
4. Custom (custom)
Operation Temperature: -10 to +60°C
Storage Temperature: -40 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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