Diffuse Reflective Sensors
Diffuse photo electric sensors "see" an object by the detecting the light that is reflected from the object. The specified sensing distances are always based on a piece of non-glossy white paper of 10cm x 10cm. Sensing distances will be shortened when the object has a smaller size and/or a different color.
Diffuse sensors with background suppression "ignore" the background and thus will give a more reliable detection.