Ultrasonic sensors measure the distance between a target and the sensor using high-frequency sound waves that are inaudible to humans. The process is simple: the sensor emits ultrasonic waves, which ...

Researchers at the Georgia Institute of Technology have created a passive motion/contact sensor that detects motion using only sound. Without electricity, electronics, or batteries. The sensors are ...

Sonair says ADAR One was assessed as a human detection sensor according to the IEC 61496 standard for electrosensitive ...

The concept is still largely theoretical, but the company describes a system built around an enormous number of tiny sensors ...