photosensor

[foh-tuh-sen-ser, -sawr]
noun
a photocell used to detect light.
Also called photodetector.


Origin:
1960–65; photo- + sensor

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
When light hits a photosensor, it produces an electrical current whose strength
  reflects the intensity of the light.
The photosensor shall be a self-contained control device that detects changes
  in light levels.
Set holiday lights on a programmable timer or a photosensor that detects dawn
  and dusk.
The gold-silver aggregates at the test sites scatter the light, which is in
  turn captured by a photosensor.
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