Even though radar uses electromagnetic waves to detect objects, the same principle has been used with other propagating waves, most often sound waves. While a well-known use of this is sonar ...

Ultrasound travels at the speed of sound which is 330 m/s in air. This is not fast enough to track fast moving aircraft or more distant objects. So, instead of using ultrasound, radio waves are ...

Piezoelectric materials have many applications, including sonar technologies and devices that generate and sense ultrasound waves. But for these devices to efficiently generate sonar or ultrasound ...