1) Effective beam
The usable beam diameter in photoelectric transmitted beam sensing which equals the lens diameter of the light source and receiver.
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The usable beam diameter in photoelectric transmitted beam sensing which equals the lens diameter of the light source and receiver.
The point at which just enough light intensity is present to trigger a photoelectric sensor given the usable area of the lens, For example, an excess gain of two would mean that just enough light intensity is present to trigger a sensor with 50% of the lens obscured with contaminants.
The ability of polarized retro-reflective photoelectric sensors to eliminate false operation as a result of shiny objects.