The chip drives the LEDs, light reflects off smoke particles, and enters the optical sensor. From there, magic algorithms turn this into a number corresponding to a particle count.

Sensor sensitivity: Here's how it really worksReplay: About a year ago, we covered the ISO and ASA systems as they apply differently to film and video cameras. There's been a lot of interest in that ...

Ambient light sensors can reveal your device activity. How big a threat is it? For now, there's no reason for concern, but that could change in coming years.

Another RVR element, the ambient light sensor (ALS), is used to interpret the impact that background lighting, such as nearby runway lights, might have on the overall visibility measurement.

If you’re curious about how traffic light sensors work, or just want to keep the flow of green lights and good vibes rolling, here’s what to know.

Face ID, Animojis, and Portrait Lighting effects in the iPhone X are all made possible by its new TrueDepth camera and sensor system. We look into how, and how well, it works.

The MS600 uses a combination of the super-precise radar tech, PIR, and light sensors to detect small movements, such as breathing, as well as general motion and light levels. The sizeable sensor ...