Photoelectric sensors use light to sense the presence, absence, or distance of target objects. They consist of an emitter light source, a photodiode or phototransistor receiver, and supporting electronics.
The basic operating principal involves the emitter (sender) transmitting a beam of light, which is directed to and detected by the receiver. This video shows a variety of sensor configurations in a packaging assembly line:
Video Credit: Intech Systems Chennai / CC BY 3.0
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