Abstract
Abstract. This research project focuses on the development of an optical 3D measuring system that enables high accurate surface measurements of welding seams in order to detect impurities. The systems concept is based on a stereo camera system in conjunction with a projecting line laser. A second camera system is used as tracking or positioning component to obtain the position of the measuring systems in object space. The complete stereo laser-profile system will be used as a hand-held system. The development, optimization and testing of the system components (stereo camera system with projecting laser line and tracking component) for surface measurements as well as calibration and accuracy evaluations are the main objectives within this research project. Testing procedures and probes are constructed and evaluated to verify the results. The development considers conditions for a future adaption to underwater use.
Highlights
The increasing construction of off-shore building sites like platforms, ports and wind power plants as well as installations in harbours and industry require further developments in terms of underwater welding and inspection techniques
Up to now no optical assisted testing systems are known for the automatic detection of the surface topography and geometry of a welding seam in underwater use
The desired measuring concept consists of a system for 3D measurement of welding seams based on a multi-camera set-up with projected laser lines (Figure 1)
Summary
The increasing construction of off-shore building sites like platforms, ports and wind power plants as well as installations in harbours and industry require further developments in terms of underwater welding and inspection techniques. The desired measuring concept consists of a system for 3D measurement of welding seams based on a multi-camera set-up with projected laser lines (Figure 1). A stereo camera system with laser line projection has been defined The advantages of such a setup are given by higher redundancy, better resolution and accuracy, and the use of standardized photogrammetric calibration methods. The current research is based on extended experiences in camera technology and calibration (Luhmann, 2010), and in modelling and calibration of 3D measuring devices as they will be applied for this work (Hastedt et al, 2005; Luhmann et al, 2008) The double-blind peer-review was conducted on the basis of the full paper
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