when expose to ultraviolet lighting. Contrast sensors are used mainly to detect registration marks
and objects in general. They use red, green or both the colors to detect the contrast between the
presence or absence of a mark or object. Brightness sensor measures the illumination intensity in
a room and is used for building automation applications. They are also used for wet and dry end
brightness grading, in-line process monitoring with spot sizes varying from 20mm to 200mm.
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