Comparison of results of interferometric phase extraction algorithms for three-dimensional flow-field tomography |
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Authors: | Yao Wei Dapeng Yan Soyoung Stephen Cha |
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Institution: | a Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094, China;b Department of Mechanical Engineering, University of Illinois at Chicago, 842 West Taylor Street, Chicago, IL 60607-7022 USA |
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Abstract: | A comparison of the results of interferometric phase information retrieval and subsequent tomographic reconstruction from deformed wavefront projections by phase unwrapping is presented. In interferogram processing, conventional fringe tracking and Fourier transform methods have been utilized for comparison. With these methods by injecting carrier fringes, the projection data of any axial cross section can be extracted in all projection directions to implement three-dimensional tomographic reconstruction. The results of experiments of a simulated temperature field prove that the phase extraction based on the Fourier transform method produces tomographic reconstruction much superior to the conventional fringe tracking technique. |
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Keywords: | Computational tomography Interferometry Image processing Phase unwrapping |
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