1. Passive Sonar
Loralee Williams
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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
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7. Sonar is actually not a word but an acronym
What is sonar?
Sonar is actually not a word but an acronym
SOund
Navigation
And
Ranging
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8. Sound is LAZY. Snell’s Law
It wants to take the slowest route possible.
Example: Thunder and Lightning
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9. Temperature Depth/Pressure Salinity Factors for Ranges.
(11.25 × temperature (in °F)) + ( × depth (in feet)) + salinity (in parts-per-thousand )
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10. Expendable Bathythermograph (XBT)
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11. XBT Drop
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12. Sonar and the Military
World War I passive systems to locate submarines
World War II- saw the first active sonar systems
1945- sonobuoys
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13. Passive Sonar
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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)
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15. A sound wave turned into a digital picture.
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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’
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19. Waterfall Display
Power Plant
50/60 HZ
Engine
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20. BIG TROUBLE!!!!!!!!!!!
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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 <
"MMAD - Products - Kaon Ltd." Home - Kaon Ltd. 19 Apr <
"NOAA/AOML UOTC What is an XBT?" University of North Carolina Wilmington. 20 Apr <
"Refraction and Snell's Law." 12 Apr <
"Review Submarine Simulation." Easynet Connect - Quality Business Internet Access. 15 Apr <
"Sonar -." Wikipedia, the free encyclopedia. 17 Apr. 2009
<
"Torpedo Hit (ABC Science)." ABC.net.au. 21 Apr <
"Understanding Sonar." The U.S. Navy. 15 Apr <