Langevin Develops Active Sonar

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Article abstract: Active sonar was developed to detect submarines but is also used in navigation, fish location, and ocean mapping.

Active Sonar, Submarines, and Piezoelectricity

Sonar, which stands for sound navigation and ranging, is the American name for a device that the British call “asdic.” There are two types of sonar. Active sonar, the more widely used of the two types, detects and locates underwater objects when those objects reflect sound pulses sent out by the sonar. Passive sonar merely listens for sounds made by...

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