A photoelectric sensor emits a light beam (visible or infrared) from its light-emitting element. A reflective-type photoelectric sensor is used to detect the light beam reflected from the target. A thrubeam type sensor is used to measure the change in light quantity caused by the target crossing the optical axis.
What is photoelectric sensors used for?
• A photoelectric sensor is used to detect the presence (or absence) of an object, or for measuring the distance between a point and an object.