ultrasonicsensor
nounUK /ˌʌltrəˈsɒnɪk ˈsɛnsə/
US /ˌʌltrəˈsɑːnɪk ˈsɛnsər/
A tool that uses sound we cannot hear to find out how far away things are.
The robot's ultrasonic sensor stopped it before it hit the wall.
RELATED WORDS
OTHER MEANINGS
2. A device in a car that helps it sense obstacles when parking.
The car beeped faster as the ultrasonic sensor detected the pole behind it.
3. A part in a robot that measures distance by bouncing sound waves off objects.
The ultrasonic sensor on the rover mapped the cave's walls.
4. A sensor used in tanks to measure liquid levels without touching the liquid.
The ultrasonic sensor told the machine how full the water tank was.