Tomographic imaging of combustion zones: Impact of measurement noise and reconstruction error

Document Type

Conference Proceeding

Publication Date

12-1-2012

Abstract

Temperate and concentration distributions of a horizontal section through a stationary test flame were reconstructed with the help of computer tomography. Simulated reconstructions are based on temperature and concentrations distributions equal to published time-averaged data of the Sandia D flame. Based on property distributions, line integrated absorption due to water vapor (H2) in the 6930-6940 cm-1 range was simulated to obtain projection values for tomographic reconstructions, where spectroscopic parameters for absorption features were obtained from the HITRAN 20041 database. Simulated projection values were calculated for direct absorption spectroscopy (DA) and wavelength modulation spectroscopy with second harmonic frequency detection (WMS-2f). The resulting projections were de-convoluted by tomographic methods, where Abel inversion and filtered backprojection were investigated. Based on the reconstructed spatial distribution of spectroscopic data, temperature and concentration profiles were obtained. Results highlight the impact of uncertainties introduced by measurement noise, deviations of reconstructed values, and tomographic artifacts. The comparisons of reconstructed results indicate that WMS-2f in conjunction with tomography is a viable method to reconstruct spatially resolved temperature and concentration distributions for stationary flames. © 2012 by Avishek Guha, Ingmar Schoegl. Published by the American Institute of Aeronautics and Astronautics, Inc.

Publication Source (Journal or Book title)

43rd AIAA Plasmadynamics and Lasers Conference 2012

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