ASSESMENT OF MEASUREMENT UNCERTAINTY CAUSED IN THE PREPARATION OF MEASUREMENTS USING COMPUTED TOMOGRAPHY |
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| Albert Weckenmann, Philipp Krämer |
- Abstract:
- X-ray Computed Tomography (CT) is the latest innovation in manufacturing metrology as it offers several opportunities which are not possible with conventional tactile or optical measurement devices: The volumetric which is gained from a CT measurement represents – in contrast to other principles in manufacturing metrology – not only the surface but even the entire volume of the object which allows the analysis of conventionally not accessible features. Due to this fact current research work is concerned with the determination of the task-specific measurement uncertainty for CT measurements as it is an important parameter describing the quality and the reliability of measurement results. This paper presents research work focused on the determination of influences which can be controlled by the machine operator in the preparation of the measurement data acquisition and evaluation, like the magnification of the workpiece, the number of projections taken, or the position and orientation of the workpiece. After the quantification of these influences a task-specific measurement uncertainty budget according to GUM has been calculated. These results can either be used to compare the user-controllable influence to the influence of the machine components on measurement uncertainty or as guidance for the operator to reduce uncertainty in preparation of measurements.
- Keywords:
- computed tomography, manufacturing metrology, measurement uncertainty
- Download:
- IMEKO-WC-2009-TC14-145.pdf
- DOI:
- -
- Event details
- Event name:
- XIX IMEKO World Congress
- Title:
Fundamental and Applied Metrology
- Place:
- Lisbon, PORTUGAL
- Time:
- 06 September 2009 - 11 September 2009