Working principle of Balluff BLA.
Inside the emitter a optical prism is used to generate a parallel band of red laser light. This light band is extremely homogenous. There are no gaps, and the light intensity is constant over the entire width of the light band. The receiver contains a CCD which detects edges of objects with high precision. A CCD consists of very precisely arranged, light-sensitive cells whose charge is measured and evaluated by the electronics.
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