By Jeff Allison, Product Manager, Pepperl+Fuchs
In a black and white world, using photoelectric sensors would be very straightforward. Every photoelectric sensor would be specified with two sensing ranges, one for the black targets and one for the white targets. Since there would be no other colors, there would be no concern for the effect of color on reflectivity and sensing range, or monitoring various shades of a color, or identifying one color out of a whole spectrum of possibilities.