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Automated 3D geometrical measurement system for mobile and large-scale conical workpiece based on laser scanning technologies

This article presents a novel automated measurement prototype for 3D geometry of mobile and large-scale conical workpiece, manipulated through two independent robot platforms that placed on its two sides with laser scanner and motorized linear stage. First, with point cloud that covers end point provided by laser scanner. Then, modeling and identification of end point of workpiece is established based on height variations in its nearest neighborhood with respect to virtual measurement datum plane, which is step-by-step derivatively generated according to initial datum point in an online virtual inspection environment. Next, the current geometry-relations between neighboring end points can be subsequently used to guide the laser scanner for high precision sampling surface area incorporating an automatic simple module. Moreover, both orientation and position geometrical relationships of the corresponding features on the fitting circles are analyzed too. Details preliminary experimental tests were performed to verify the measuring accuracy of this method.