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2046 |
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Wednesday, May 05, 2010, Sophia Room 9:20 AM Process Diagnostics 2 |
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Error analysis of image-based measurement methods in thermal spraying processes: a simulation driven approach |
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Lars Rockstroh* / Stuttgart University /
Institute of Parallel and Distributed Systems, Germany Marek Wroblewski / Stuttgart University / Institute of Parallel and Distributed Systems, Germany Juergen Hillebrand/ Stuttgart University / Institute of Parallel and Distributed Systems, Germany Ana Balevic/ Stuttgart University / Institute of Parallel and Distributed Systems, Germany Mohammed Zubair Shaikh/ Stuttgart University / Institute of Parallel and Distributed Systems, Germany Sven Simon/ Stuttgart University / Institute of Parallel and Distributed Systems, Germany Rainer Gadow/ Stuttgart University / Institute for Manufacturing Technologies of Ceramic Components and Composites, Germany |
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In general, it is hard to verify the error of image-based measurement methods applied in thermal spraying applications such as Particle Image Velocimetry and Particle Tracking Velocimetry, due to the lack of reference systems with higher accuracy and comparable measuring volumes. This paper presents a simulation-driven approach in order to specify the error of image-based measurement methods. The tool PVsim (Particle Velocimetry simulations) is introduced which simulates the imaging system as well as the particles of a thermal spraying process and generates images according to the simulation settings. In order to estimate the overall error, PVsim compares characteristics of the simulated particles to measurements based on simulation-generated images. Multiple simulations with identical particle characteristics and trajectories but different settings to the imaging system enable conclusions about the overall error of different measurement setups. The verification of PVsim is based on data measured by a reference system, known parameters of the thermal spraying process and specifics of the reference imaging system. The comparison of simulated images with images taken during real measurements verifies the functionality of PVsim. |