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Topic: Hydrophone

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	Hydrophone
		A hydrophone amplifier may be a printed circuit board for building in into a hydrophone or it may be a unit in a seperate box placed on dry land.
		Hydrophones may be used for picking up of weak sound vibrations under water and the signal must be amplified by a high impedance hydrophone amplifier.
		Hydrophones and amplifiers are used for studying underwater acustics and monitoring of sonar and communication sounds signals from dolphins, porpoises and whales.
	www.etec.dk /hydrophones.html (0 words)

	hydrophone - Encyclopedia.com
		hydrophone, device that receives underwater sound waves and converts them to electrical energy; the voltage generated can then be read on a meter or played through a loudspeaker.
		The hydrophone is the marine equivalent of the microphone, which receives and converts sound waves in air.
		A hydrophone, used to detect objects in water, sits on Bob Eller's lawn in Gloucester, Virginia.
	www.encyclopedia.com /doc/1E1-hydrophon.html (493 words)

	VEMCO - Resources - Tutorials - Hydrophone Types
		Omnidirectional hydrophones receive signals from all directions with equal sensitivity, and are used for data telemetry from captive animals or stationary transmitters.
		Directional hydrophones have higher sensitivity to signals from a particular direction, and are used in tracking and location systems to determine the direction of a transmitter.
		Hydrophone cables attenuate the signal and are subject to noise influence from other electrical equipment.
	www.vemco.com /resources/l_hydro.php (815 words)

	Acoustics Monitoring Program
		In May, 1996 the array was successfully deployed in the eastern equatorial Pacific to begin long-term monitoring of the East Pacific Rise between 20N and 20S.
		In February 1999, an array of six hydrophones was deployed in the North Atlantic between 15N and 35N and in June 2002 an additional six hydrophones were deployed between 40-52N along the mid-Atlantic Ridge.
		Hydrophones were deployed in the Gulf of Alaska for marine mammal monitoring in 2000.
	www.pmel.noaa.gov /vents/acoustics/haru_system.html (128 words)

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