DEFINITION OF SONAR

Sonar is a process that analyzes transmitted and

reflected underwater sound waves to find and locate submerged

objects and measure the distances underwater. Sonar

works by sending out subsurface sound waves and then waiting

for the returning echoes. A computer or a human operator

then analyzes the data. In 1906 Lewis Nixon invented

sonar in the hopes of being able to detect underwater icebergs;

interest later grew larger during World War I when

sonar was identified as being able to locate submerged submarines.

Various types of sonar are used today, both in science

and the military, as well as special kinds of sonar found

in the medical field. Most of these uses of sonar work off the

same principles but have been specially adapted for use in

their respected fields.

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