The range of low-frequency sonar is remarkable. Dolphins and whales can tell the difference between objects as small as a BB pellet from 50 feet (15 meters) away, and they use sonar much more than sight to find their food, families, and direction. The LFA sonar being tested by the military can travel thousands of miles, and could cover 80% of the earth's oceans by broadcasting from only four points. The frequency that both whales and the military use falls between 100 and 500 Hz. Whales send signals out between 160 and 190 Db, the Navy has tested its sonar signals at levels up to 235 Db.
Thursday, 4 February 2010
What is Sonar?
The range of low-frequency sonar is remarkable. Dolphins and whales can tell the difference between objects as small as a BB pellet from 50 feet (15 meters) away, and they use sonar much more than sight to find their food, families, and direction. The LFA sonar being tested by the military can travel thousands of miles, and could cover 80% of the earth's oceans by broadcasting from only four points. The frequency that both whales and the military use falls between 100 and 500 Hz. Whales send signals out between 160 and 190 Db, the Navy has tested its sonar signals at levels up to 235 Db.
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ReplyDeleteBelow is a link that shows a blind person that has developed a sonar like system to navigate through the world.
ReplyDeletehttp://www.youtube.com/watch?v=6jqwdLPAocY"