Introduction:
photo reflective 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.
- Upper left: diode's anode
- Lower left: diode's cathode
- Upper right: phototransistor's collector
- Lower right: phototransistor's emitter
Applications:
- Timing sensors.
- Edge sensors.
- Disc drivers.
- Liquid level sensor.