[Video] Ultrasonic Sensors
Ultrasonic sensors (also known as transceivers when they both send and receive https://www.bjultrasonic.com/category/ultrasonic-transducer/
) work on a principle similar to radar or sonar which evaluate attributes of a target by interpreting the echoes from radio or sound waves respectively. Ultrasonic sensors generate high frequency sound waves and evaluate the echo which is received back by the sensor. Sensors calculate the time interval between sending the signal and receiving the echo to determine the distance to an object.