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Abstract

For the detection of--or for the determination of the position of edges (K) of objects (G), a light source/sensor device arrangement in the manner of a light barrier is utilized, in which the light beam generated by the light source (12) is focussed to a light line (10) in an object plane (O). Foreseen furthermore are devices for the generation of a relative movement between the light beam and edges (K) to be detected or objects (G), in such a manner, that edges (K) to be detected are moved in the object plane (O) and in doing so are aligned parallel to the light line (10). In particular for the detection of edges (K) of transparent objects (G), sensor devices (11.1-11.3) in a receiving zone (B) are equipped in such a manner, that they measure not only light intensities in the area of the axis (A) of the light beam, but also intensities of light, which is deflected from the light beam by an edge (K) in the object plane (O) positioned transverse to the light line (10). By means of the optical local redundancy in the object plane (O) and/or in the receiving zone (B), a higher precision and a reduced susceptibility to errors in the detection--or in the determination of the position of edges (K) are achieved.

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