For one, it only takes a small radio receiver to detect lightning strikes, and [mircemk] shows us exactly how to do that. When lightning flashes, it also lights up an incredibly wide spectrum of ...

Engineered with a polarization filter that allows only light received from a specially designed reflector to be recognized by the detector, the Series OPDM 12 retro-reflective laser sensors ...

The sensor uses a laser diode and a photodiode to detect and count particles, while a fan moves air through the system.

Researchers have developed a sensor made from 'frozen smoke' that uses artificial intelligence techniques to detect formaldehyde in real time at concentrations as low as eight parts per ...