Definition of "photosensor" []

• A photodetector (noun)

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• "A photosensor is provided that can automatically turn off the display in bright daylight or incandescent light."
• "So if you measure the brightness of a wall in this room with a very fast photosensor, and feed the result in another monitor that receives the exact same synchronization signals for steering its electron beam, you get to see an image like this (after using a mathematical signal processing technique -- ed.)"
• "Computer scientist Markus Kuhn demonstrated a way to read CRT computer monitors at a distance using a photosensor, even if you're not facing the screen."