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 ability of polarized retro-reflective photoelectric sensors to eliminate false operation as a result of shiny objects.
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.