%0 Journal Article
%T Optical Multi-Sensor Metrology for Extruded Profiles
%A Albert Weckenmann
%A Johannes Bernstein
%J Metrology and Measurement Systems
%D 2010
%I 
%R 10.2478/v10178-010-0005-9
%X Nowadays the process-control of concave extruded profiles is a measuring task with rising requirements. A novel optical bi-sensorial measurement system - consisting of a shadow- and a light-section-system - as well as suitable methods of analysis for in-line inspection are presented. The proposals help to ensure the product quality on a higher level than before. The combination of dimensional accuracy and data-density leads to excellent results. Extruded profiles are semi-finished products (from steel, brass, aluminum, synthetics¡­) which are appointed for wide applications in technical products. For monitoring and controlling the parts in-line adequately, today often the shading technology is used. It detects - neglecting the profiles coat in measurement range - with high precision the dimension of the objects shadow orthographically to the axis of illumination. As a matter of fact, concave and local areas cannot be recorded. Alternatively, light-section-systems can measure concave zones and undercut zones but do not comply with the required accuracy. The combination of accuracy and data-density qualifies the mentioned multi-sensor metrology for realizing a maximum of efficiency in process control what ensures product quality and less defective goods. The optical multi-sensor measurement system has to be calibrated and aligned to detect the same surface zone despite of high refresh rates and optical resolutions. The metered characteristics will be coordinate transformed to extrinsic world-coordinates for evaluating form deviations of complex parts. An appropriate user-interface enables to re-calculate measurement objects in-line and evaluate the conformity of the part consequently. Finally the real length information assists to influence the process control. After a successful test in the laboratory the results will be proved in production to the target: measurement uncertainty of better than 0.1 mm at every profile.
%K multi-sensor-measurement
%K optical measurement
%K laser scanning
%U http://versita.metapress.com/content/5q92k4x61057x745/?p=446eebcc8fde41e9bcc2554035b8d0e8&pi=4