Abstract
This paper describes the optical measuring system that has been developed to measure the position of a mobile drilling unit used during a semitrailer chassis manufacturing process. This measurement system uses optical stereometric techniques to determine, through triangulation, the mobile drilling unit position from images captured by two cameras that incorporate the system. These two cameras have a swivel degree of freedom that allows them to follow continuously the mobile drilling unit. To reduce costs and simplify system design, rather than use two encoders to measure the rotation angles of the cameras, fixed reflective markers have been used. The three-dimensional coordinates of these reflective markers are constant and known; this way, it is possible to determine the cameras reference system orientation anytime from the image coordinates of the markers projections in each camera images. The measurement system has been tested using a prototype which has the same characteristics than the tools that will be used during the manufacture of the semitrailer chassis.
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