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A METHOD FOR THE THREE-DIMENSIONAL MEASUREMENT OF CO-ORDINATES AND A THREE-DIMENSIONAL CO-ORDINATES MEASURING APPARATUS THEREFORE.
A METHOD FOR THE THREE-DIMENSIONAL MEASUREMENT OF CO-ORDINATES AND A THREE-DIMENSIONAL CO-ORDINATES MEASURING APPARATUS THEREFORE.
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机译：一种用于坐标的三维测量的方法和一种用于测量装置的三维坐标的方法。
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摘要
The invention relates to a method for the three-dimensional measurement of coordinates (xli, yli, zli) of a set of N predetermined points (Plij) of the surface of a mechanical part to be measured, relatively to a predetermined reference system (Ro), and the direction cosines (cxthij) cythij, czthij) of the theoretical normals (Nthij) thereto at the theoretical points (Pthij) corresponding to said N predetermined points (Plij) are known, and including: - a preparatory phase (1), in which the coordinates (xoij, yoij, zoij) of N points (Poij), corresponding to said N predetermined points (Plij) of the surface of a first mechanical part taken as a standard part, are measured relatively to the predetermined reference system (Ro), - an initialization phase (2), in which N displacement measurements (loij) along said normals (Nthij) are simultaneously and respectively read on said N points (Poij) of said standard part, - a measurement phase (3), in which N linear displacement measurements (llij), simultaneously and respectively performed on said N points (Plij) of the part to be measured corresponding to the N points (Poij) of said standard part, are read, - a computation phase (4), in which the three-dimensional coordinates (xlij, ylij, zlij) of the N points of the part to be measured are computed from the three-dimensional coordinates (xoij, yoij, zoij) of the N points of said standard part, from the linear measurements (loij, llij), and from the direction cosines (cxthij, cythij, czthij) of the N theoretical normals at these points. In particular, the invention is applied in metrology for measuring precision mechanical parts.
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