Omron Photoelectric Sensors
Photoelectric sensors, or optical sensors, leverage the changes to an optical beam caused by interaction with the object under test. A photoelectric sensor consists of an emitter that generates the optical signal and a receiver (typically a photodiode) that detects it. Photoelectric sensors can be classified as through-beam or reflective; reflective photoelectric sensors can be further broken down into diffuse and retroreflective types.
