Broadband Hydrophone: Low Noise, Low Power, and Low Frequency

BII7010 Series Broadband Hydrophone: Low Noise, Low Power, and Low Frequency

The directional response patterns are omnidirectional in low frequency range and toroidal in high frequency range. Typical quality factor Q are 2 in useful frequency range. Pulsed sounds reach stable state quickly with short ringing. Custom-fit hydrophones with low power preamplifiers consume 1 to 2mA which is a great merit for battery-powered portable acoustic system. Service temperature can be customized to 200°C or 392°F.
These hydrophones provide low cost solutions for field recording, field listening, and acoustic research in laboratory from 0.2Hz to 500 kHz. They come with coax/shielded cables and underwater mateable/BNC/TRS/XLR/DIN/MIL-5015 style connectors, and are ready to be integrated into underwater acoustic systems. They support digital recorders and DAQs (A/D Converter). the output signal can be used for speaker system and headphones.
Small size and broadband of bespoke BII7015 offers benefit for uses in parabolic receivers underwater to achieve the highest pressure gain and the narrowest beam width which are the merits in weak signal detection and searching, directional high speed communication, etc.
Hydrophones with integrated low power preamplifiers and filters are ideal gears to amplify weak underwater sounds and reject ambient noises. Some preamplifiers can drive cable up to 1000m without significant signal loss. These features allows them to be used in long line arrays (streamers) and large planar arrays.
The smooth dome and small size reduce interferences to acoustic field under test. Hydrophone body possesses streamlined hemispherical domes which minimize the drag force and the hydrodynamic noise caused by the hydrophone in motion or the flow past the hydrophone. They can measure the sound radiations and pressure changes in turbulent processes and flows.

Low Frequency Sounds in the Ocean at 1 Hz to 1 kHz. Low Frequency Sounds between 1Hz to 1kHz undergo little attenuation in ocean and lakes: 1.2x10^-7 at 1Hz, 0.0002 at 10Hz, 0.0015 at 100Hz, 0.07 at 1kHz, in dB/km, proximately. The major propagation losses are Spreading Loss, Absorption and Scattering at boundaries such as seafloor sediments. The sounds being trapped in deep sound channel or SOFAR channel avoiding losses from both top and bottom boundaries can propagate very big area with very low loss. These low frequency sounds contain valuable information on their sources and propagation areas such as Weathers (Winds, Rains, Surface Waves, Ice, Storms, …), Geological Process (Earthquakes, Tsunamis, Moving of Tectonic Plates and Crusts,…), Marine Animals (Whales, Dolphins, Fish, Invertebrates, …), Anthropogenic Activities (Shipping, Harbor, Oil and Wind Energy Extraction, Air Guns, …). Besides sounds detection or monitoring with deployment at 1000m depth, the distributed hydrophone network in shallow water (at a specific depth) can also be used to detect and monitor upward sounds being refracted from SOFAR channel.

Typical Applications
Towed/Dipping Hydrophone, Sonobuoy. LBL, SBL, USBL Positioning. Underwater Parabolic Antennas. Reference Hydrophone, Noise Measurement. Signal detection in strong currents.	Detection of Ultrasonic Cavitation Noise, Thermoacoustics in Gas. Passive Acoustic Monitoring (PAM System). Linear and Planar Array Element, Vector Hydrophone Element. Marine Bioacoustics, Phantom-power Hydrophone, Sound Recording. Studies of Ocean Turbulence and Flow, Marine Hydrodynamics.
Related Products
BII1000 Hydrophone and Ultrasonic Preamplifier.	BII7000 Omnidirectional Spherical Hydrophone, Up to 700kHz.
BII7120 Low Noise Hydrophone, Noise Below Sea-state Zero.	BII7180 Miniature Hydrophone: Φ1.0 to Φ3.5mm Aperture.

Specification

Low Noise Low Power Broadband Hydrophones

Hydrophone	FFVS (dBV/μPa)	Usable Frequency	Directivity Pattern	Depth Rating	No Preamp	Built-in Preamp
BII7011 Series	-194+Preamp Gain	0.2Hz to 70kHz	Omnidirectional to Toroidal	100 to 950m	Datasheet	Datasheet
BII7012 Series	-198+Preamp Gain	0.2Hz to 90kHz	Omnidirectional to Toroidal	300m	Datasheet	Datasheet
BII7013 Series	-200+Preamp Gain	0.3Hz to 160kHz	Omnidirectional to Toroidal	500m	Datasheet	Datasheet
BII7014 Series	-206+Preamp Gain	2.0Hz to 260kHz	Omnidirectional to Toroidal	300m	Datasheet	Datasheet
BII7015 Series	-210+Preamp Gain	3.0Hz to 450kHz	Omnidirectional to Toroidal	300m	Datasheet	Datasheet

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