Photoelectric Proximity Sensor, Background Suppression

A photoelectric proximity sensor is a device that detects the presence or absence of an object without physical contact. It works by emitting light and measuring the amount of reflected light. When an object enters the sensor's range, it reflects some of the emitted light back to the sensor, which triggers a signal.

Background suppression is a feature often included in photoelectric proximity sensors that helps to eliminate false triggering caused by ambient light or other background sources. This is achieved by using a specific type of sensor that can differentiate between the reflected light from the target object and the background light.

• Some background suppression techniques include:
• Light-on-dark (LOD): The sensor emits light onto the target object, and only detects the reflected light when it is darker than the background.
• Dark-on-light (DOL): The sensor detects the absence of light from the target object against a bright background.