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Passive Sonar

Passive Sonar. Loralee Williams. UNCLASSIFIED. UNCLASSIFIED. UNCLASSIFIED. UNCLASSIFIED. UNCLASSIFIED. Topics. What is sonar Snell’s Law Factors for ranges/how it is measured M ilitary history of sonar Passive sonar - types -how it is used. UNCLASSIFIED. What is sonar?.

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Passive Sonar

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  1. Passive Sonar Loralee Williams UNCLASSIFIED

  2. UNCLASSIFIED

  3. UNCLASSIFIED

  4. UNCLASSIFIED

  5. UNCLASSIFIED

  6. Topics • What is sonar • Snell’s Law • Factors for ranges/how it is measured • Military history of sonar • Passive sonar - types -how it is used UNCLASSIFIED

  7. What is sonar? • Sonar is actually not a word but an acronym SOund Navigation And Ranging UNCLASSIFIED

  8. Snell’s Law Sound is LAZY. It wants to take the slowest route possible. Example: Thunder and Lightning UNCLASSIFIED

  9. Factors for Ranges. • Temperature • Depth/Pressure • Salinity 4388 + (11.25 × temperature (in °F)) + (0.0182 × depth (in feet)) + salinity (in parts-per-thousand ) UNCLASSIFIED

  10. Expendable Bathythermograph (XBT) UNCLASSIFIED

  11. XBT Drop UNCLASSIFIED

  12. Sonar and the Military • World War I- 1915 passive systems to locate submarines • World War II- saw the first active sonar systems • 1945- sonobuoys UNCLASSIFIED

  13. Passive Sonar UNCLASSIFIED

  14. Types of Passive Sonar • AN/SQS-53C Hull Mounted Sonar • AN/SQR-19 TowedArray Sonar • AN/SQQ-28 LAMPS MK III Sonobuoy Processing System • AN/AQS-13F Dipping Sonar • Undersea Surveillance System (IUSS) UNCLASSIFIED

  15. A sound wave turned into a digital picture. UNCLASSIFIED

  16. UNCLASSIFIED

  17. UNCLASSIFIED

  18. What can be determined with passive sonar? • Blade rate • Shaft rate • # of blades • Cylinder firing rate • # of cylinders • Power plant • Turbine rate • ‘Fog horns’ UNCLASSIFIED

  19. Waterfall Display Power Plant 50/60 HZ Engine UNCLASSIFIED

  20. BIG TROUBLE!!!!!!!!!!! UNCLASSIFIED

  21. Review • What is sonar • Snell’s Law • Factors for ranges/how it is measured • The military history of sonar • Passive sonar - types -how it is used UNCLASSIFIED

  22. Work cited • Basic Sonar System." Federation of American Scientists. 18 Apr. 2009 <http://www.fas.org/man/dod-101/navy/docs/es310/asw_sys/asw_sys.htm>. • "MMAD - Products - Kaon Ltd." Home - Kaon Ltd. 19 Apr. 2009 <http://www.kaon.co.uk/mmad.asp>. • "NOAA/AOML UOTC What is an XBT?" University of North Carolina Wilmington. 20 Apr. 2009 <http://www.uncwil.edu/CMSR/capefear/tech/XBT.htm>. • "Refraction and Snell's Law." 12 Apr. 2009 <http://www.ndt-ed.org/EducationResources/CommunityCollege/Ultrasonics/Physics/refractionsnells.htm>. • "Review - 688 Submarine Simulation." Easynet Connect - Quality Business Internet Access. 15 Apr. 2009 <http://easyweb.easynet.co.uk/~ianboys/688rev.htm>. • "Sonar -." Wikipedia, the free encyclopedia. 17 Apr. 2009 • <http://en.wikipedia.org/wiki/Sonar>. • "Torpedo Hit (ABC Science)." ABC.net.au. 21 Apr. 2009 <http://www.abc.net.au/science/articles/2005/09/01/1448475.htm>. • "Understanding Sonar." The U.S. Navy. 15 Apr. 2009 <http://www.navy.mil/oceans/sonar.html>.

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