Photo sensors detect the presence, absence and exact position of objects based on the reflection or interruption of the emitted direct light beams.
Direct light beams are emitted by emitter toward a distant target, and are received by a receiver either in a single housing (Diffuse, Background suppression and Retro-reflective sensors) or a separate housing (Through-beam sensor).
When the target is detected, the sensor either provides a switching signal or a distance value.
Some operating principles detect either light reflected from the target, the diffuse and background-suppression sensors follow this principle, and the interruption of the beam by the target, which is the principle of the through beam sensors.
Photo sensors are divided into the following categories:
- Diffuse reflection sensor
- Retro-reflective sensors
- Through-beam sensors
Photo sensors provide long-distance, non-contact, and reliable detection of different object materials, colors and contrasts.
Photo sensors are used in diverse applications of industrial manufacturing such as material handling, packaging and paper, food and beverage, life sciences and medical, robotics and so on.