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Title: Improved methodology for performing the inverse Abel transform of flame images for color ratio pyrometry
Authors: Dreyer, Jochen A. H.
Slavchov, Radomir I.
Rees, Eric J.
Akroyd, Jethro
Salamanca, Maurin
Mosbach, Sebastian
Kraft, Markus
Keywords: Engineering::Chemical engineering
Issue Date: 2019
Source: Dreyer, J. A. H., Slavchov, R. I., Rees, E. J., Akroyd, J., Salamanca, M., Mosbach, S., & Kraft, M. (2019). Improved methodology for performing the inverse Abel transform of flame images for color ratio pyrometry. Applied Optics, 58(10), 2662-2670. doi:10.1364/ao.58.002662
Journal: Applied Optics 
Abstract: A new method is presented for performing the Abel inversion by fitting the line-of-sight projection of a predefined intensity distribution (FLiPPID) to the recorded 2D projections. The aim is to develop a methodology that is less prone to experimental noise when analyzing the projection of axisymmetric objects—in this case, co-flow diffusion flame images for color ratio pyrometry. A regression model is chosen for the light emission intensity distribution of the flame cross section as a function of radial distance from the flame center line. The forward Abel transform of this model function is fitted to the projected light intensity recorded by a color camera. For each of the three color channels, the model function requires three fitting parameters to match the radial intensity profile at each height above the burner. This results in a very smooth Abel inversion with no artifacts such as oscillations or negative values of the light source intensity, as is commonly observed for alternative Abel inversion techniques, such as the basis-set expansion or onion peeling. The advantages of the new FLiPPID method are illustrated by calculating the soot temperature and volume fraction profiles inside a co-flow diffusion flame, both being significantly smoother than those produced by the alternative inversion methods. The developed FLiPPID methodology can be applied to numerous other optical techniques for which smooth inverse Abel transforms are required.
ISSN: 1539-4522
DOI: 10.1364/AO.58.002662
Schools: School of Chemical and Biomedical Engineering 
Rights: © 2019 Optical Society of America. All rights reserved. This paper was published in Applied Optics and is made available with permission of Optical Society of America.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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