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1) Photoelectric

A form of sensor that uses light to detect the presence or absence of a physical object.  See also Sensor .

2) Synchronous detection

The use of an exact sequence of light pulses to activate the output on a photoelectric cell.

3) Convergent beam

Another name for fixed focus sensing where the photoelectric sensor will only detect objects at a fixed distance from the sensor.

4) Effective beam

The usable beam diameter in photoelectric transmitted beam sensing which equals the lens diameter of the light source and receiver.

5) First surface protection

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

6) Skew angle

The angle at which photoelectric sensors are sometimes mounted in retro-reflective applications so as to prevent the reflection of the object itself from triggering the sensor.

7) Excess gain

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.