What is the common name for a sound wave sensor?

The common name for a sound wave sensor is the ultrasonic detector. This device is designed to emit and receive high-frequency sound waves that are above the range of human hearing. Ultrasonic detectors function by sending out sound waves and measuring the time it takes for the echoes to return after bouncing off objects. This capability allows them to detect distance, motion, or even presence in an area.

Ultrasonic detectors are widely used in various applications, including security systems, automatic doors, and in robots for obstacle avoidance. Their reliance on sound waves to operate differentiates them from other types of sensors, such as radar or proximity detectors, which may utilize different principles such as radio waves or electromagnetic fields. This unique characteristic is what firmly places ultrasonic detectors in the category of sound wave sensors.