photoelectric register control

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photoelectric register control [¦fōd·ō·i′lek·trik ′rej·ə·stər kən‚trōl]

(control systems)

A register control using a light source, one or more phototubes, a suitable optical system, an amplifier, and a relay to actuate control equipment when a change occurs in the amount of light reflected from a moving surface due to register marks, dark areas of a design, or surface defects. Also known as photoelectric scanner.

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