Passive Sonar

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

LightningUNCLASSIFIED

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 measuredThe military history of sonarPassive sonar- types -how it is used

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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>.