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There is a present-day need of optimization of the combustion processes andcatalytic efficiency for minimization of emission of pollutants, which can bepossible by analyzing the temperature and combustion products distribution inthe combustion processes internally. This paper discusses the feasibility ofsimultaneous 2-D tomographic imaging of temperature and concentrations ofCO$_2$ and H$_2$O by scanning a single narrowband laser. The choice ofspectroscopic lines of H$_2$O for two-tone temperature measurement is discussedaround the wavelength range of 2000 nm. This region is selected as both H$_2$Oand CO$_2$ spectral lines have sufficient intensity levels. The pair ofwavenumbers (5005.53 and 5003.3 cm$^{-1}$) is found the best of all fortemperature and H$_2$O concentration distribution and 5004.36 cm$^{-1}$ ischosen for CO$_2$. To establish the efficacy of different reconstructionalgorithms, the phantoms of bimodal and concentric temperature distributionwith uniform concentration were tried with four reconstruction techniques.Impressive reconstructions were achieved for distribution of temperature andconcentrations of H$_2$O and CO$_2$ for same types of phantoms using FilteredLandweber and Tikhonov regularization methods for 5005.53 and 5003.3 cm$^{-1}$.Initially the imaging was tried using both fanbeam and discrete irregular beamarray with 100 and 31 beams respectively. Instead of less number of beams, thelater one also shows very promising result.

A computational study for tomographic imaging of temperature, water and  carbon dioxide concentration in combustion gases using a single tunable diode  laser