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METHOD FOR DETERMINING THE POSITION OF AT LEAST ONE EDGE OF AN OBJECT BY EVALUATING FRESNEL DIFFRACTION BORDER PROFILES
METHOD FOR DETERMINING THE POSITION OF AT LEAST ONE EDGE OF AN OBJECT BY EVALUATING FRESNEL DIFFRACTION BORDER PROFILES
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机译:通过评估菲涅耳衍射边界轮廓确定物体至少一个边的位置的方法
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摘要
The invention relates to a method for determining the position of at least one edge of an object, in particular of a strand, comprising steps of: illuminating the object using light from at least one coherent light source, diffraction borders being generated on both geometric boundaries of the shadow formed by the object. In one embodiment, the intensity profiles are first differentiated according to the location. Each differentiated intensity profile can either be plotted on a quadratic position axis and compared to a periodic reference intensity profile, or be directly compared to a reference intensity profile that results from a periodic function. In a second embodiment, the intensity profiles are compared to a reference intensity profile that results from a periodic function, if this function has a period length with a substantially inversely linear dependency on the location, and if the function is integrated over the location.
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