Interest in Sonar was increased during World War I when there was a need to be able to detect submarines. Lewis Nixon invented the very first Sonar type listening device in 1906, as a way of detecting icebergs. This early research led to the invention of dedicated sonar devices by other inventors. The Sonar device will send out a subsurface sound wave and then listens for returning echoes, the sound data is relayed to the human operators by a loudspeaker or by being displayed on a monitor.Īs early as 1822, Daniel Colloden used an underwater bell to calculate the speed of sound underwater in Lake Geneva, Switzerland. It has been used for submarine and mine detection, depth detection, commercial fishing, diving safety and communication at sea. Sonar is a system that uses transmitted and reflected underwater sound waves to detect and locate submerged objects or measure the distances underwater.
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