photoelectric counter

photoelectric counter

[¦fōd·ō·i′lek·trik ′kau̇nt·ər]
(electronics)
A photoelectrically actuated device used to record the number of times a given light path is intercepted by an object.
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Photoelectric counters have the problem that "they count what they see," so that they will count fragments or may miss an item obscured by another.

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