hydrophone - ορισμός. Τι είναι το hydrophone
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Τι (ποιος) είναι hydrophone - ορισμός

UNDERWATER MICROPHONE
Underwater microphone; Hydrophones; Hydrophone(s)
  • A hydrophone being lowered into the North Atlantic
  • Hydrophones and directional hydrophones using a baffle.

hydrophone         
¦ noun a microphone which detects sound waves under water.
Hydrophone         
A hydrophone () is a microphone designed to be used underwater for recording or listening to underwater sound. Most hydrophones are based on a piezoelectric transducer that generates an electric potential when subjected to a pressure change, such as a sound wave.
SOSUS         
  • First SOSUS stations
  • The [[GIUK gap]]
  • LOFARgram
  • NAVFAC Nantucket showing Terminal building as internal security area.
  • NAVFAC Cape May (1955-1962) Terminal Building on WW II Coast Artillery bunker before storm damage forced move to Fort Miles in Delaware where it became NAVFAC Lewes.
  • Officer and enlisted IUSS insignia.
  • ''Neptune'' (ARC-2), first cable repair ship formally assigned to Project Caesar.
  • P-3B of Patrol Squadron 6 (VP-6).
  • Point Sur Lightstation and in background NAVFAC Point Sur (1969)
  • Naval Facility Brawdy, Wales, the first "super NAVFAC" to be established.
  • SWATH]] design, for SURTASS/LFA operations.
  • USNS ''Zeus''
  • LOFARgram writers on NAVFAC watch floor.
CHAIN OF UNDERWATER LISTENING POSTS
SOund SUrveillance System; Sosus; Sound Surveillance System; Sound Surveillance Systems; Integrated Undersea Surveillance System; Equatorial Pacific Ocean autonomous hydrophone array; Project Caesar
The Sound Surveillance System (SOSUS) was a passive sonar system developed by the United States Navy to track Soviet submarines. The system's true nature was classified with the name and acronym SOSUS themselves classified.

Βικιπαίδεια

Hydrophone

A hydrophone (Ancient Greek: ὕδωρ + φωνή, lit. 'water + sound') is a microphone designed to be used underwater for recording or listening to underwater sound. Most hydrophones are based on a piezoelectric transducer that generates an electric potential when subjected to a pressure change, such as a sound wave.

A hydrophone can detect airborne sounds, but will be insensitive because it is designed to match the acoustic impedance of water, a denser fluid than air. Sound travels 4.3 times faster in water than in air, and a sound wave in water exerts a pressure 60 times that exerted by a wave of the same amplitude in air. Similarly, a standard microphone can be buried in the ground, or immersed in water if it is put in a waterproof container, but will give poor performance due to the similarly bad acoustic impedance match.