Glossary


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1) Echo

The time elapsed between pulse emission and reception that is used to determine target position in an ultrasonic proximity sensor.

2) First surface protection

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

3) 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.

4) Data transmission

The use of sensors to transmit data via pulse-modulated light beam systems typically from host stations to mobile carriers such as AGV's or stacker cranes.

5) Deadband

An unusable area extending from the face of an ultrasonic proximity sensor to the minimum sensing distance allowing for target detection where pulses are received too quickly to be accurately evaluated.