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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.
There are two types of sonarâactive and passive. Active Sonar. Active sonar transducers emit an acoustic signal or pulse of sound into the water. If an object is in the path of the sound pulse, the sound bounces off the object and returns an âechoâ to the sonar transducer. If the transducer is equipped with the ability to receive signals, it measures the strength of the signal.