Passive SonarLoralee Williams
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TopicsWhat is sonarSnell’s LawFactors for ranges/how it is measured
Military history of sonarPassive sonar- types -how it is used UNCLASSIFIED
What is sonar?Sonar is actually not a
word but an acronymSOund
NavigationAnd
RangingUNCLASSIFIED
Snell’s Law
Sound is LAZY.It wants to take the slowest
route possible. Example: Thunder and
Lightning
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Factors for Ranges.TemperatureDepth/PressureSalinity4388 + (11.25 × temperature (in °F)) + (0.0182 × depth (in feet)) + salinity (in parts-per-thousand )
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Expendable Bathythermograph (XBT)
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XBT Drop
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Sonar and the MilitaryWorld War I- 1915 passive systems to locate submarines
World War II- saw the first active sonar systems
1945- sonobuoysUNCLASSIFIED
Passive Sonar
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Types of Passive SonarAN/SQS-53C Hull Mounted Sonar
AN/SQR-19 TowedArray Sonar
AN/SQQ-28 LAMPS MK III Sonobuoy Processing System
AN/AQS-13F Dipping SonarUndersea Surveillance System (IUSS)
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A sound wave turned into a digital picture.
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What can be determined with passive sonar?
Blade rateShaft rate# of bladesCylinder firing rate# of cylindersPower plantTurbine rate‘Fog horns’ UNCLASSIFIED
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Power Plant50/60 HZ
Engine
Waterfall Display
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BIG TROUBLE!!!!!!!!!!!
ReviewWhat is sonarSnell’s LawFactors for ranges/how it is measured
The military history of sonarPassive sonar- types -how it is used
UNCLASSIFIED
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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