A simple Abel inversion method of interferometric data for temperature measurement in axisymmetric medium |
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Authors: | Mahfoud El fagrichHassan Chehouani |
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Institution: | LP2M2E, Faculty of Sciences and Techniques, BP549, University Cadi Ayyad, Gueliz, Marrakech 40000, Morocco |
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Abstract: | In this work, we describe a simple method of Abel inversion for temperature measurement in a natural convection axisymmetric flow. The essence of the method is that the measured lateral fringe shift profile is fitted with a polynomial with only even powers and then Abel inverse integral is evaluated analytically. This technique is compared with recent existing methods to test the accuracy and error propagation using a simulated interferogram of natural convection flow below a downward-facing heated horizontal disk in air. For this comparison, lateral fringe profiles are simulated using temperature fields computed by solving Navier Stokes and energy equations. Through random-number generation, noise profile is artificially added to the simulated noise-free lateral fringe shift profile. The results showed that the proposed technique for Abel inversion leads to accurate temperature profiles when the lateral fringe shift profile is fitted with even-power polynomials having degrees ranging from 20 to 30. |
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Keywords: | Abel inversion Holographic Interferometry Heat Transfer Temperature measurement |
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