How do Sonar sensors work?

How does an Ultrasonic Distance Sensor work? The Ultrasonic Sensor sends out a high-frequency sound pulse and then times how long it takes for the echo of the sound to reflect back. The sensor has 2 openings on its front. read more

The transmitter sends a pulse of sound which travels through the water and is reflected from solid objects (actually, anything with a different sound speed from water, including fish swim bladders). The sensor then converts the incoming sound wave to an electrical voltage, and it is then analysed by the device. read more

Students learn about how ultrasonic sensors work, reinforcing the connection between this sensor and how humans, bats and dolphins estimate distance. They learn the echolocation process—sound waves transmitted, bounced back and received, with the time difference used to calculate the distance of objects. read more