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electric eye
(redirected from electric eyes)

    Also found in: Dictionary/thesaurus, Wikipedia 0.06 sec.
electric eye: see photoelectric cell photoelectric cell or photocell, device whose electrical characteristics (e.g., current, voltage, or resistance) vary when light is incident upon it.
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photocell

 or photoelectric cell or electric eye

Solid-state device with a photosensitive cathode that emits electrons when illuminated and an anode for collecting the emitted electrons. Illumination excites electrons, which are attracted to the anode, producing current proportional to the intensity of the illumination. In a photovoltaic cell, light is used to produce voltage. In a photoconductive cell, light is used to regulate the flow of current. Photocells are used in control systems, where interrupting a beam of light opens a circuit, actuating a relay that supplies power to a mechanism to bring about a desired operation, such as opening a door or setting off a burglar alarm. Photocells are also used in photometry and spectroscopy.



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For example, planter seed tube electric eyes use 8 volts on their power wire but send a 12-volt signal to the control console.
Diagnostic Accuracy by Anderson, Dan / Farm Journal
It's not unusual for hotels and luxury apartment basement garages to have electric eyes that decide when to turn the lights on, rather than 24-hour illumination.
Dark star: new regulations seek to avert a pending energy crisis in ... by Rapoza, Kenneth / Latin Trade
A piece of paper can break one of the electric eyes and cut the power.
THE GETTY ADVENTURE BEGINS WITH A TRAM RIDE by Daily News (Los Angeles, CA)
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