Invention of Sonar Kassidy Kervin What is Sonar? So nar was - - PowerPoint PPT Presentation

Invention of Sonar

Kassidy Kervin

What is Sonar?

• Sonar was invented in 1906

and is short for sound navigation and ranging

• Sonar is a system that

measures the ocean's depth and detects objects by sending

• ut sound pulses and then

measuring them after they reflect off the objects and return

How is Sonar used?

• Sonar is used to detect underwater hazards to

navigation, search and map objects on the seafloor and map the seafloor itself

• It is also used to develop nautical charts which are

maps that depict the configuration of the shoreline and seafloor

How does sonar work?

• A Sonar device will send out a sound wave below

surface and then listen for echoes to return

• Sonar can be passive or active
• Passive is used by the navy to detect submarines or

ships while active is used to measure distance with sound

• They can tell how far away an object is by recording

the time it takes for sound to travel there and back

How has Sonar progressed throughout the years?

• Lewis Nixon invented the first ever Sonar type listening

device in 1906 and used it as a way to detect icebergs

• In 1915 the first sonar device used to detect submarines

was created which helped to influence later designs

• As Sonar continues to progress we are able to get a

better and more accurate map of the ocean floor

bibliography

http://www.edhelper.com/ReadingComprehension_54_3250.html http://inventors.about.com/od/sstartinventions/a/sonar_history.htm http://oceanservice.noaa.gov/facts/sonar.html Image one http://2012ojhswaves.weebly.com/uploads/1/0/3/3/10333324/2413443_orig.jpg Image two http://www.physicsinfo.co.uk/?page=view&id=1560