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Multi-component fringe projection sensors allow the fast, holistic, exact, robust, contact free sampling of a workpiece surface and also a flexible configuration as well as the possibility for automation of measurements. However, requirements concerning knowledge, diligence and experience of operators, which use and configure fringe projection sensors, increased dramatically. Today, the planning and the following performance of an inspection are done via “trial and error”. There is no standardized, methodical approach established yet. Thus the significance of an inspection relies very much on the operator. Therefore there is a need for assistance and counseling systems for multi-component fringe projection sensors to support the operator. In this paper the concept and the prototype of an assistance system for multi-component fringe projection sensors will be introduced. The assistance system fulfils two tasks. As first task, the inspection planner is supported when he determines the ideal sighting- and positioning-strategy. The support comprises not only expert knowledge, but as a key element the result of a planned inspection is simulated. Based on entry masks, the performance (optical parameters) of a fringe projection sensor in given configuration is calculated first. As next step the measurement result and the measurement uncertainty for specific measurement tasks in a chosen measuring pose, that means the deposition of workpiece in measuring area, are simulated. Thus the quality of a planned inspection can be evaluated. Additional optimizing algorithms were implemented. These algorithms allow the simulation of a series of measurements with varying measuring poses and the comparison of the resulting measurement uncertainties, so that the best configuration for the measurement device and the ideal sighting- and positioning-strategy can be determined. As second task, the operator is guided step-by-step through the actual measurement by detailed handling instructions and a context-sensitive presentation of expert knowledge. Recapitulatory, the assistance system supports the inspection planner when he sets up a new inspection process and guides the operator through the actual inspection. Thus the inspection process is shortened and its robustness is risen by use of the presented assistance system. Intended audience and benefits for the conference: This paper is especially addressed both to users of fringe projection sensors, who have to set up task specific sighting- and positioning-strategies, and to developers of fringe projection sensors which have to deliver workpiece-compatible sensor configurations to their customers. But also the users of other optical inspection systems benefit from this paper, as the shown concept can be adapted to other sensors as well. The benefits on business of an assistance system for multi-component fringe projection sensors will be demonstrated within this paper. Such benefits are e.g. the saving of time and money or the reduction of measurement uncertainty. |
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