There are many measurement tasks in industry and in academic research, which may not be accomplished with common measurement methods, due to the exceeding dimension of the work pieces. For such purposes more and more laser trackers are utilized, which can be seen as coordinate measuring devices featuring special characteristics such as mobile and high precision optical measurement tasks. Laser trackers are capable of measuring volumes with a diameter up to 80 meters.
However, until now there exists no approved traceability procedure. This lack of knowledge considering the performance of laser trackers makes it necessary to use more conservative estimations of the measurement quality.
Therefore, the Chair of Metrology and Quality Management is developing a new method for the mathematical estimation of the measurement uncertainty in cooperation with the Physikalisch Technische Bundesanstalt (PTB).
This estimation is based - according to the GUM - upon an uncertainty model of the laser tracker. The evaluation of all combined uncertainty measurement factors is then performed similarly to virtual coordinate measuring machines, through a repetitive numerical simulation (Monte Carlo method).
This method is especially suitable for the evaluation of the measuring uncertainty from complex measurement processes, as it does not require a closed-form solution of the output-input parameter relation.
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Dipl.-Ing. Andreas Witte