| 摘要 |
The invention relates to a multi-dimensional measuring machine for linear, spatially bent workpieces, for example pipelines or sheet-metal edges. At the outer end of a spatially movable, position-detecting measurement arm a spatially swivellable and likewise position-detecting sensor is fitted which can make contact with a specific point orthogonally to the contour characteristic of the object to be measured. In order to make contact in a non-touching manner and without force reactions on the workpiece, the sensor is designed as a multiple fork-type light barrier which can be guided over the linear object to be measured. The light beams of the different light barriers which are at an angle to each other but are located in a single plane have a defined diameter. When the light barriers are shaded by a specific fraction, a position detection is triggered and thus for a specific contour point of an object to be measured the position and direction of its tangent is determined. For a specific plane of cross-section of the object to be measured, the subsequent shading of the individual light barriers and their respective spatial position - they envelop as it were the cross-section - result in the tube diameter, the central point position of the tube cross-section, and a possible deviation from the circular form.
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