2020/12/29 by Satwik Choudhury, Choudhury, Satwik, Sandip Pal +1
Chemistry · Engineering · Environmental Science · Medicine · #Atmospheric and Environmental Gas Dynamics #FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Laser Design and Applications #Optical Imaging and Spectroscopy Techniques #Photoacoustic and Ultrasonic Imaging #Spectroscopy and Laser Applications
paper · pdf · doi:10.48550/arxiv.2012.14780
openalex publication_date 2020/12/29 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
There is a present-day need of optimization of the combustion processes and\ncatalytic efficiency for minimization of emission of pollutants, which can be\npossible by analyzing the temperature and combustion products distribution in\nthe combustion processes internally. This paper discusses the feasibility of\nsimultaneous 2-D tomographic imaging of temperature and concentrations of\nCO2 and H2O by scanning a single narrowband laser. The choice of\nspectroscopic lines of H2O for two-tone temperature measurement is discussed\naround the wavelength range of 2000 nm. This region is selected as both H2O\nand CO2 spectral lines have sufficient intensity levels. The pair of\nwavenumbers (5005.53 and 5003.3 cm-1) is found the best of all for\ntemperature and H2O concentration distribution and 5004.36 cm-1 is\nchosen for CO2. To establish the efficacy of different reconstruction\nalgorithms, the phantoms of bimodal and concentric temperature distribution\nwith uniform concentration were tried with four reconstruction techniques.\nImpressive reconstructions were achieved for distribution of temperature and\nconcentrations of H2O and CO2 for same types of phantoms using Filtered\nLandweber and Tikhonov regularization methods for 5005.53 and 5003.3 cm-1.\nInitially the imaging was tried using both fanbeam and discrete irregular beam\narray with 100 and 31 beams respectively. Instead of less number of beams, the\nlater one also shows very promising result.\n