Abstract: A method for determining the position of at least one edge of an object, in particular a strand, comprises illuminating the object using light from at least one coherent light source, wherein diffraction borders are generated on both geometric boundaries of the shadow caused by the object. The method also includes recording the spatial intensity profile of at least one diffraction border using at least one single or multi line optical sensor, differentiating the at least one recorded intensity profile with respect to location and plotting it using a squared location axis, and comparing the at least one recorded intensity profile, differentiated with respect to location and plotted using a squared location axis, to at least one periodic reference intensity profile. The position of at least one edge of the object is determined on the basis of the completed comparison.

Abstract: A method for determining the position of at least one edge of an object, in particular a strand, comprises illuminating the object using light from at least one coherent light source, wherein diffraction borders are generated on both geometric boundaries of the shadow caused by the object. The method also includes recording the spatial intensity profile of at least one diffraction border using at least one single or multi line optical sensor, differentiating the at least one recorded intensity profile with respect to location and plotting it using a squared location axis, and comparing the at least one recorded intensity profile, differentiated with respect to location and plotted using a squared location axis, to at least one periodic reference intensity profile. The position of at least one edge of the object is determined on the basis of the completed comparison.

Abstract: Method for measuring the cross-sectional dimension of an elongated profile having rounded or sharp edges, in particular of a flat or sector cable by illuminating the article with light sources and determination of a plurality of shadow borders and calculating the parameter of the circle from the coordinates of the light sources and the shadow borders. The dimensions are determined from the circular parameter.

Abstract: Method for measuring the cross-sectional dimension of an elongated profile having rounded or sharp edges, in particular of a flat or sector cable by illuminating the article with light sources and determination of a plurality of shadow borders and calculating the parameter of the circle from the coordinates of the light sources and the shadow borders. The dimensions are determined from the circular parameter.

Abstract: A method for measuring the diameter of an elongated article approximately circular in cross section, in particular of a wire or of a cable, which may include some or all of the following: illumination of the article with a fan-shaped beam of at least one monochromatic light source approximately point shaped in the measuring plane, wherein the main beam direction stands preferably perpendicular on the longitudinal axis of the article receiving the light on a single or multiple lined light-sensitive sensor on the oppositely lying side of the article, wherein the axis of the sensor stands preferably perpendicular on the main beam direction measuring the distance of the article to the sensor or the light source determining a value corresponding to the article diameter by evaluating the intensity patterns in the diffraction patterns at the edges of the shadow caused by the article, and of the measured diameter the distance of the light source to the article or of the sensor to the article is selected such that

Abstract: A method for measuring the diameter of an elongated article approximately circular in cross section, in particular of a wire or of a cable, with the following method steps