Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1992-12-09
1995-10-10
Pham, Hoa Q.
Optics: measuring and testing
By polarized light examination
With light attenuation
356385, 356387, G01B 1108
Patent
active
054575370
ABSTRACT:
An optical-electrical measuring method for determining cross-sectional dimensions particularly of elongate articles with reference to at least one straight line, which is applied to the periphery of the cross-section and contacts the cross-section at, at least two points, and apparatuses for carrying out that method are presented. A light beam moved within a measuring field by a parallel displacement transverses at measurable locations in the measuring field boundaries of a region which is vignetted by the article disposed in the measuring field. The surface of the article is illuminated at a point by the same light beam when it has been deflected or by another light beam, and the distance from the axis of the light beam at the location of a predetermined boundary of the vignetted region to that illuminated point is determined in that an image of that point is formed at an angle which differs from the angle of the illumination and the location of the image is determined by triangulation. The entire measuring system is pivotally moved relative to the orientation of the cross-section of the article about an axis which is parallel to the longitudinal axis of the article. As a result, a detectable discontinuity of the change of the determined distance is detected, which discontinuity is characteristic of that angular position of the measuring system in which the axis of the light beam at the location of the predetermined boundary of the vignetted region contacts the periphery of the cross-section at at least two spaced apart points.
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