Benthowave Instrument Inc.

BENTHOWAVE INSTRUMENT INC. Acoustic Transducer & System 

Directional Hydrophone (Acoustic Sensor)

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BII-7070 Series  Directional Hydrophone (Acoustic Sensor)

Benthowave manufactures directional hydrophone with conical beam for uses in detection of weak signals, broadband signals, pipeline leaks, and tracking of sound sources. Besides underwater applications, these acoustic sensors are also designed for applications in air to detect acoustic emission and ultrasonic sounds. (Note: The couplant such as water or gel is a must-have material to provide efficient acoustic coupling between the transducer face and the piece under test in air applications.)

BII-7070 series Hydrophones provide conical beam ranging from omni (low frequency) to 4.3° (400kHz), and is designed for use in general underwater acoustic system and accurate direction-finding Sonar system. Below the critical frequency fc, BII-7070 are of single beam hydrophones without side lobes. This feature makes BII-7070 be a ideal candidate for target angle estimation systems or sound source tracking systems.

With built-in preamplifiers, BII-7070 series hydrophones have higher sensitivity and can transmit signal over long cable.

Optional mounting parts are available for installation on portable-mounting apparatus, submersibles, pipe, tank or vessel.

If you do not find any transducer suitable to your project, please contact BII for custom designs on size, operating frequency, beam width, mounting, etc...

tracking sound sources                          Direction-finding Sonar

Applications  
Direction-finding Sonar
LBL/SBL/USBL Positioning System
Locating Marker/Pinger/Beacon/Transponder
Tracking of Acoustic Tags
Acoustic Pipeline Leak Detection
Acoustic Emission Detection
Structural Health Monitoring
Ultrasonic Sensor/Receiver
Monitoring Aquarium/Pool Safety/Alarm System
Bioacoustic Research of Marine Animals
Features  
High Sensitivity
Broadband
Conical Beam
No Side Lobe in Low Frequency Range
Usable Frequency Range: up to 500 kHz
Easy Installation/Mounting
Related Products  
Hydrophone
Preamplifier
BII-7190 Directional Hydrophone (Direction-finding)
BII-7210 Discrete Line Array: Spatial Filtering

Specification

Critical Frequency fc: Side lobes exist in the case of operating frequency f > fc; The hydrophone has no side lobe in the case of f ≤ fc.
±90° Sidelobe Frequency fn: First Side Lobes exist at ±90° normal to acoustic axis in the case of  operating frequency f = fn.
BII-7070 Series Hydrophone without Preamplifier
Signal Loss over Extension Cable (dB) = 20*log[Ch/(Ch+Cc)]; Ch: Hydrophone Capacitance; Cc: Capacitance of Extension Cable.
Cable is of 100pF/meter roughly. Valid for hydrophone without preamplifier.
Hydrophone Sensitivity:
dBV/µPa
Capacitance
nF
Usable
Frequency
-3dB
Beamwidth:
fc
kHz
fn
kHz
Cable
Length
Size: mm
ΦDxH
Weight
Gram
BII-7071
-197.8+Signal Loss 0.16 1Hz to 400kHz 9900°/f(kHz) 212 282 ≤3m Φ14.5x26 50
BII-7072 -197.8+Signal Loss 0.3 1Hz to 400kHz 5600°/f(kHz) 120 160 ≤8m Φ21x26 150
BII-7073 -197.8+Signal Loss 0.9 1Hz to 400kHz 3200°/f(kHz) 69 92 ≤25m Φ33x26 210
BII-7074 -197.8+Signal Loss 3.5 1Hz to 400kHz 1700°/f(kHz) 34.6 46 ≤100m Φ60x26 550
BII-7071BB -205.0+Signal Loss 0.28 1Hz to 500kHz 9900°/f(kHz) 212 282 ≤3m Φ14.5x26 50
BII-7072BB -205.0+Signal Loss 0.7 1Hz to 500kHz 5600°/f(kHz) 120 160 ≤8m Φ21x26 150
BII-7073BB -205.0+Signal Loss 2.0 1Hz to 500kHz 3200°/f(kHz) 69 92 ≤25m Φ33x26 210
BII-7074BB -205.0+Signal Loss 7.8 1Hz to 500kHz 1700°/f(kHz) 34.6 46 ≤100m Φ60x26 550
Depth Rating: 1. Default: 300m (Blank)
2. Deep Water: 950m (DW), Specify when ordering.
Output Signal: Single Ended (SE)
Cable: 1. Default: 50Ω Small Coax (ΦD=2.8mm) (Coax)
2. RG58 50Ω Coax (RG58)
3. Shielded cable with two conductors (ΦD=3.6mm) (SC36)
4. Shielded cable with two conductors (ΦD=6.5mm) (SC65)
   
BII-7070 Series Hydrophone with Built-in Preamplifier
Note: Hydrophone Size with two ΦDxL: first ΦDxL is the size of sensing element, second ΦDxL is the size of preamplifier housing.
Hydrophone Sensitivity
dB V/µPa
Usable
Frequency
-3dB
Beamwidth
fc
kHz
fn
kHz
Size: mm
ΦDxH
Weight
Gram
BII-7075 Custom:
-197.8+Preamplifier Gain
20Hz to 400kHz 9900°/f(kHz) 212 282 Φ14.5x15
Φ21x35
100
BII-7076 Custom:
-197.8+Preamplifier Gain
20Hz to 400kHz 5600°/f(kHz) 120 160 Φ21x50 300
BII-7077 Custom:
-197.8+Preamplifier Gain
1Hz to 400kHz 3200°/f(kHz) 69 92 Φ33x50 360
BII-7078 Custom:
-197.8+Preamplifier Gain
1Hz to 400kHz 1700°/f(kHz) 34.6 46 Φ60x50 700
BII-7079 Custom:
-197.8+Preamplifier Gain
100Hz to 400kHz 29450°/f(kHz)) 600 800 Φ8x15
Φ21x89
90
BII-7075BB Custom:
-205.0+Preamplifier Gain
20Hz to 500kHz 9900°/f(kHz) 212 282 Φ14.5x15
Φ21x35
100
BII-7076BB Custom:
-205.0+Preamplifier Gain
20Hz to 500kHz 5600°/f(kHz) 120 160 Φ21x50 300
BII-7077BB Custom:
-205.0+Preamplifier Gain
1Hz to 500kHz 3200°/f(kHz) 69 92 Φ33x50 360
BII-7078BB Custom:
-205.0+Preamplifier Gain
1Hz to 500kHz 1700°/f(kHz) 34.6 46 Φ60x50 700
BII-7079BB Custom:
-205.0+Preamplifier Gain
50Hz to 500kHz 29450°/f(kHz) 600 800 Φ8x15
Φ21x89
90
Depth Rating: 300m (Blank)
Input Noise Density: 33µPa/√Hz at 1kHz
Preamplifier: BII-1000 Series Hydrophone Preamplifier
Preamplifier Gain: Options: 0/26/40/60dB, Specify gain when ordering
Overload Pressure Level: 20*log(Maximum Output/2.828) - Sensitivity, (dB μPa).
High Pass Filter: Built-in. Specify gain when ordering
Output Type: 1. Default: Single Ended Output (SE). Append SE to the listed part number.
2. Differential Output (DF). Append DF to the listed part number.
Maximum Output: Maimum Output of the built-in preamplifier, Vpp.
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 rated voltage.
DO NOT use switching mode DC power supply.
Supply Voltage: +8.5 to +30 VDC
Current: 4.8 or 8 mA, Preamplifier dependent.
Cable: Shielded cable (ΦD=6.5mm) (SC)
Cable Length: Custom: Up to 200m  
 
Miscellaneous: BII-7070 Series Hydrophone
Beam Pattern: Conical
Sidelobe Level: <-20 dB when f > fc; No side lobe when f ≤ fc.
Receiving Face: Bottom Face
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 (Plastics): (BFMP)

5. Bolt Fastening Mounting (Stainless Steel): (BFMSS)
6. Thru-hole Mounting + Free Hanging (THFH)
Click
Transducer and Hydrophone Mounting for more detailed information on mounting/installation.
Connector Options: 1. Default: Wire Leads (WL)
2. BNC Male (BNC)
3. 3.5 mm (⅛″) TRS Plug (TRS35)
4. ¼″ (6.35 mm) TRS Plug (TRS635)
5. XLR Plug (XLR)
6. Underwater Mateable Connector (UMC)
7. MIL-5015 Style (5015)
8. +9VDC Battery Snap (BS) (Exclusive to preamplified hydrophone)

9. Custom (custom)
Operating Temperature: -10°C to +60°C
Storage Temperature: -40°C to +60°C
How to Order: Click How to Order.
Hydrophone Wiring: Click Hydrophone Wiring for detailed wiring information.
Receiving Array: Array & Aperture Design
Technical Documents: BII-7070 series and BII-7070BB series Sensitivity (RVR or OCV)

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