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Sonar

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Sonar

  1. 1. The Role of Waves in SONAR Ruary Thompson
  2. 2. SONAR Used to stand for:SOund Navigation And Ranging (Now is accepted as a word itself)• Invented & first used by Lewis Nixon in 1906 to detect icebergs.• Sound waves travel through water, refract, and let instruments know where obstacles are.• Utilizes sound waves, NOT electromagnetic waves.• Sound waves are longitudinal.• Usually connected to the navy, but also used in nature (Whales/dolphins)
  3. 3. Active SONAR• Active SONAR involves sending sound waves to detect obstacles.• Accurate, used by whales as well as naval crafts.• However, can give away position. http://www.solarnavigator.net/images/Sonar_sound_ping_send_return_effect_principle.JPG
  4. 4. Passive SONAR• Involves silently listening to other sound waves• Not accurate unless triangulated • Triangulation: multiple receptors allow you to pinpoint a noise source• Silent, good in combat situations (i.e. submarine fights) http://www.solarnavigator.net/images/Sonar_sound_ping_send_return_effect_principle.JPG
  5. 5. More on SONAR• Uses sound waves which travel better than light waves in water.• Navy sonar can actually kill cetaceans (Dolphins and whales). It deafens then, and causes them to hemorrhage.• However, active is quite accurate at mapping sea floors: http://oceanservice.noaa.gov/facts/sonarstellwegen.jpg Image of a shipwreck rendered through Active Sonar
  6. 6. BibliographyBellis, M. (2012). The History of Sonar. Retrieved 9 24, 2012, from About:http://inventors.about.com/od/sstartinventions/a/sonar_history.htmLeo, K. (2011). Navy Sonar and Acoustic Impacts. Retrieved 9 24, 2012, from Koholaleo:http://www.koholaleo.com/noise_pollution__impacts.htmlNOAA. (2011, 11 17). Sonar uses sound waves to see in the water. Retrieved 9 24, 2012,from National Oceanic and Atmospheric Administration:http://oceanservice.noaa.gov/facts/sonar.html

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