Ultrasonic Sensors: A Smart Choice for Shorter-Range Applications (.PDF Download)

Ultrasonics refers to signals that are above the human hearing span (>20 kHz), and usually in the 40- to 70-kHz range. These signals are used like radar—they’re radiated toward a target and reflected back to the source. By measuring the time between the originally radiated signal and its reflection, and knowing the speed of sound, the distance to the target can be computed.

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