Invention of Sonar Kassidy Kervin
What is Sonar? ● So nar 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 out 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
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