Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK

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  • Publication
    A flexible laser scanner system for on-line process monitoring
    ( 1994)
    Seliger, G.
    ;
    Schuler, H.
    ;
    Hsieh, L.-H.
    This paper describes a geometrical sensor system for on-line process monitoring. The sensor consists of a double ligth stripe laser scanner and a modular software for sensor data processing which have been developed in the scope of an EC ESPRIT III project. The paper presents firstly the industrial requirements revealed by a market survey and the overall system architecture. In the second part of the paper the developed novel software algorithms and an example application of the sensor system are described in detail.
  • Publication
    Erkennung formvarianter Geometrien mit einem Laserscanner auf der Basis evolutionärer Algorithmen
    ( 1994)
    Seliger, G.
    ;
    Hsieh, L.-H.
    ;
    Voit, L.
    ;
    Schuler, H.
    In this paper, we describe a new geometry measurement system with a robot guided laser scanner which is capable to handle new applications by its recognition and configuration flexiblity. By the use of an optimization algorithm basing on revolutionary algorithms it is able to determine both, geometry and position deused for guidance of automated assembly processes. By the example of sensor guided welding of car door hinges it will be shown how the new geometry recognition system tackies automated robot guided assembly.
  • Publication
    Computer-aided planning system for multiple laser-scanner applications
    ( 1994)
    Schuler, H.
    ;
    Hsieh, L.-H.
    ;
    Seliger, G.
    Laser scanners are efficient tools for on-line inspection of workpiece dimensions and for closed-loop process control.Relevant industrial applications require frequently multiple scanners to acquire many significant dimensions of the workpiece at the same time.One of the most crucial tasks hereby is to determine the spatial arrangement of multiple scanners.Until now, this task has been achieved by triel and error.Heuristic rules are available for simple geometry but not available for complicated workpiece geometry.The effectiveness of this planning approach can only be checked after the physical system installation.This paper presents a computer-aided planning system which derives an optimal spatial arrangement of the multi-scanner setup for 2-dimensional measurement tasks automatically.The necessary inputs of the system are the geometry of the workpiece, the regions of interest on the workpiece and the technical specifications of the sensors.Effects of changing properties such as accu racy or range of the selected sensors can be studied through a realistic sensor simulation. (RSS).The accuracy of the multi scanner setup can be verified on the planning system by specifying the accuracy and the relative arrangement of the single scanners.