electric eye

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electric eye:

see photoelectric cellphotoelectric cell
or photocell,
device whose electrical characteristics (e.g., current, voltage, or resistance) vary when light is incident upon it. The most common type consists of two electrodes separated by a light-sensitive semiconductor material.
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electric eye

[i¦lek·trik ′ī]

photoelectric cell

A device incorporated in an electric circuit; in response to light that falls on the cell, the electrical output or the resistance varies; used in measuring devices and in control devices that depend on illumination level or the interruption of a light beam.
References in periodicals archive ?
Test the electric eye by placing an object in its path while closing the door.
Tokyo Electric eyes building nuclear power plants in Asia
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.
Its only purpose is to take out Taiwan's electric eyes and ears and to make Taiwan vulnerable to Chinese missiles and bombs.
Door control options include induction loop, remote control, photo electric eyes, pull cord and control stations.
None was equipped with electric eyes or edge sensors, which were not mandated until 1993, but all were equipped with reversal mechanisms.
In the "old" foundry, an in-house-engineered conveyorized mold handling system uses 1200 electric eyes to control the movement and position of each mold as it progresses along three parallel conveyor lines.
Chubu Electric eyes calling for power saving in winter
Matsushita Electric eyes building lithium ion battery plant in Osaka
It does not have the sand traps that would show footprints, the barbed wire designed to stop a speeding truck or electric eyes that would activate machine guns.