Benthowave Instrument Inc.

BENTHOWAVE INSTRUMENT INC. Acoustic Transducer & System 

Broadband Miniature Probe Hydrophone

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BII-7180 Series Broadband Miniature Probe Hydrophone

BII-7180 series are miniature hydrophones with small probe size and usable up to 1.6 MHz. Multiple hydrophones can be configured as a vector hydrophone (vector sensor) or array for uses in extraction of directional information, measurement of particle velocity, particle acceleration and pressure gradient.

Besides underwater applications, BII-7183 are also designed for applications in air to detect acoustic emission, audible and ultrasonic sounds. (Note: The couplant such as water or gel is a must-have material to provide efficient acoustic coupling between the receiving face of the hydrophone and the piece under test (the subject) in air applications.)

BII's probe hydrophones are practical and handy tools for research and application of Helmholtz Integral Equation in underwater acoustics and for the measurement of pressure or intensity distribution of near-field and far-field radiated from vibrational and acoustical sound sources underwater.

Helmholtz Integral Equation

When BII-7181, BII-7182 and BII-7183 are used in low frequency range from 1Hz to 1kHz, the input impedance of the receiving device shall be high enough to avoid significant attenuation and loss of the signal.

Technical Notes:
Particle Velocity in x direction ux = - 1/(jωρ)*(аpx); ρ: Density; аpx: Pressure Gradient in the x direction.
Dipole Vector Hydrophone: Voltage Response V=M*(d/λ)*cosθ; M: Amplitude Constant related to element sensitivity; d: spacing distance between two elements; θ: Arriving angle from the axis of the two elements.

Suggested Application  
Study of Acoustic Radiation Field General Purpose Hydrophone, Reference Hydrophone
Helmholtz Integral in Acoustics Near-field Calibration and Measurement
Elements of Vector Hydrophones/Array High Frequency, High Sound Level Measurement (Cavitation can't attack hydrophone)
Research in Boundary Element Acoustics Trouble-shooting, Maintenance and Development of Transducers and Array
Features  
Miniature size, broadband Customized sensitivity
Very low interference to acoustic field under test Long cable driving capability

Specification

BII-7180 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.
-3dB cut-off frequency of high pass filter f = 1/(2*PI*R*Ch); R: Input Resistance of receiving device; Ch: Hydrophone Capacitance.
Hydrophone Sensitivity
dB V/μPa
Frequency
Range
Capacitance
nF
Acceleration Sensitivity
dB µPa/(m/s²)
 Directivity
HorizontalxVertical
Size
mm
Weight
gram
BII-7181 OCV 1Hz to 1.0MHz 0.49 (0.1m cable)
0.68 (2.0m cable)
115 Omnix290°
@300kHz
Φ4.6x8
Φ6.4x38.1
37
BII-7182 OCV 1Hz to 1.6MHz 0.25 (0.1m cable)
0.43 (2.0m cable)
111 Omnix280°
@500kHz
Φ3.0x8
Φ6.4x38.1
37
BII-7183 -187.3 1Hz to 400kHz 0.64 (2.0m cable) N/A Conical Beam
29450°/f(kHz)
Φ8.0x5 10
Note: Hydrophone Size with two ΦDxL: first ΦDxL is the size of sensing probe, second ΦDxL is the size of Solid Support.
Cable Length: 1. Default: 2m
2. Custom: up to 6 m
Cable: BII-7181 and BII-7182: 50 ohms Coax (Coax)
BII-7183: 32 ohms Mini Coax (Minicoax)
Cable Orientation: 1. BII-7181 and BII-7182: Perpendicular to end face of hydrophone.
2. BII-7183: Perpendicular to side wall in default.
 
BII-7180 Series Hydrophone with Preamplifier
Note: Hydrophone Size with three ΦDxL: first ΦDxL is the size of sensing element, second ΦDxL is the size of Solid Support, third ΦDxL is the size of preamplifier housing.
Hydrophone Sensitivity
dB V/μPa
Usable
Frequency
Range
 High Pass Filter
(Default)
Noise Density
(RTI)@1kHz
Acceleration Sensitivity
dB µPa/(m/s²)
 Directivity
HorizontalxVertical
Size
mm
Weight
gram
BII-7186 OCV 1Hz to 1.0MHz 7Hz 36.0 dB µPa/√Hz 115 Omnix290°
@300kHz
Φ4.6x8
Φ6.4x38.1
Φ21x40
110
BII-7187 OCV 1Hz to 1.6MHz 14Hz 34.5 dB µPa/√Hz 111 Omnix280°
@500kHz
Φ3.0x8
Φ6.4x38.1
Φ21x40
110
BII-7188 -187.3+
Preamp Gain
1Hz to 400kHz 8Hz 33.0 dB µPa/√Hz N/A Conical Beam
29450°/f(kHz)
Φ8x3
Φ8x38.1
Φ21x89
90
Preamplifier Gain: Options: 0dB, 26dB, 40dB, specify when ordering.
Overload Pressure Level: 20*log(Maximum Output/2.828) - Sensitivity (dB μPa).
Custom Filter: Yes, specify when ordering
Maximum Output: (Supply Voltage - 3) Vpp
Supply Voltage: +8.5 to +30VDC
Current (Quiescent): 10 mA
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.
Cable Length: 1. Default: 10m
2. Custom: up to 50 m
Cable: Shielded Cable (SC)
Cable Orientation: Perpendicular to end face of hydrophone.
 
Miscellaneous: BII-7180 Series Hydrophone
Max. Operating Depth: 50 m
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 (Plastics): (BFMP)
6. Bolt Fastening Mounting (Stainless Steel): (BFMSS)
7. Thru-hole Mounting + Free Hanging (THFH)
Click Transducer and Hydrophone Mounting for more detailed information on mounting/installation.
Connector: 1. Wire Leads (WL)
2. Default: BNC Male (BNC)
3. Underwater Mateable Connector (UMC)
4. MIL-5015 Style (5015)
5. +9VDC Battery Snap (BS) (Exclusive to preamplified hydrophone)
6. 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

BII-7183 Cable Orientation:

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