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Electric eye for a garage door opener. An electric eye is a photodetector used for detecting obstruction of a light beam. An example is the door safety system used on garage door openers that use a light transmitter and receiver at the bottom of the door to prevent closing if there is any obstruction in the way that breaks the light beam.
Conceptual through-beam system to detect unauthorized access to a secure door. If the beam is interrupted, the detector triggers an alarm. A photoelectric sensor is a device used to determine the distance, absence, or presence of an object by using a light transmitter, often infrared, and a photoelectric receiver.
Close-up image of a surface-mount LED Close-up of an LED with the voltage being increased and decreased to show a detailed view of its operation A bulb-shaped modern retrofit LED lamp with aluminum heat sink, a light diffusing dome and E27 screw base, using a built-in power supply working on mains voltage
"Electric Eye" is an allusion to the book Nineteen Eighty-Four by George Orwell, in the use of the name of the pseudo-omniscient camera that watches over the community at all times. In this dystopia , the form of government, Ingsoc ( Newspeak for English Socialism), is utterly totalitarian , and if citizens are caught rebelling in any manner ...
"No one, when he has lit a lamp, puts it in a cellar or under a basket, but on a stand, that those who come in may see the light. The lamp of the body is the eye. Therefore when your eye is good, your whole body is also full of light; but when it is evil, your body also is full of darkness.
Grand Central covers 48 acres (19 ha) and has 44 platforms, more than any other railroad station in the world. Its platforms, all below ground, serve 30 tracks on the upper level and 26 on the lower. Its platforms, all below ground, serve 30 tracks on the upper level and 26 on the lower.
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