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Sonar is a way of communicating, navigating, and detecting objects by using sound propagation. For the remainder of this lesson, we will focus on underwater sonar, which is used by submarines and some aquatic animals to perform the previously mentioned tasks.
In 1915, Paul LangÃ©vin invented the first sonar type device for detecting submarines called an echo location to detect submarines using the piezoelectric properties of the quartz. His invention arrived too late to help very much with the war effort, though, LangÃ©vin's work heavily influenced future sonar designs.