+An **Ultrasonic Sensor** uses high-frequency **[Sound](/wiki/sound)** waves to detect objects and measure their distance. It works by emitting a pulse and calculating the time it takes for the **[Echo](/wiki/echo)** to return, providing non-contact proximity sensing in many applications.
+## See also
+- [Sonar](/wiki/sonar)
+- [Transducer](/wiki/transducer)
+- [Proximity Sensor](/wiki/proximity_sensor)
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