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SICK has Photoelectric Proximity Sensors offerings that include:

Photoelectric Sensors for Explosive Areas, Laser Photoelectric Sensors, Cylindrical, Photoelectric Sensors, Miniature to Standard sizes.

Features:

Photoelectric proximity sensors with background blanketing (BGB): Same as background suppression, only the distance from the sensing plane to the object is larger.
Sender and receiver in one housing,
No reflector required, Reacts to light reflected off object to be detected