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[foh-tuh-sen-ser, -sawr] /ˈfoʊ təˌsɛn sər, -sɔr/
a photocell used to detect light.
Also called photodetector.
Origin of photosensor
1960-65; photo- + sensor Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for photosensor
  • 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.
  • Lighting designated for dusk-to-dawn operation shall be controlled by an astronomical switch or photosensor.
  • The lighting system uses effective daylighting combined with efficient fixtures and photosensor and occupancy-sensor controls.

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