使用单个可调谐二极管laser对燃烧气体中的温度、水和二氧化碳浓度进行层析成像的计算研究
A computational study for tomographic imaging of temperature, water and carbon dioxide concentration in combustion gases using a single tunable diode laser
摘要：
目前需要优化燃烧过程和催化效率，以使污染物的排放最小化，这可以通过分析燃烧过程中的温度和燃烧产物分布来实现。本文讨论了用单束窄带激光扫描同时对CO $_2$和H $_2$ O的温度和浓度进行二维层析成像的可行性。讨论了在2000 nm波长范围内H $_2$ O双色调测温光谱线的选择。选择该区域是因为H $_2$ O和CO $_2$谱线都具有足够的强度水平。对温度和H-$_2$-O浓度分布而言，发现波数对（5005.53和5003.3 cm $^{-1}$）是最好的，对CO $_2$而言，选择5004.36 cm $^{-1}$。为了确定不同重建算法的有效性，尝试了四种重建技术的双峰和同心温度分布与均匀浓度的幻影。使用5005.53和5003.3 cm $^{-1}$的过滤Landweber和Tikhonov正则化方法，对相同类型的体模的H $_2$ O和CO $_2$的温度和浓度分布进行了令人印象深刻的重建。最初，分别使用具有100个和31个光束的扇形光束和离散不规则光束阵列来尝试成像。而不是更少的梁数，后者也显示出非常有前途的结果。
英文摘要：
There is a present-day need of optimization of the combustion processes and catalytic efficiency for minimization of emission of pollutants, which can be possible by analyzing the temperature and combustion products distribution in the combustion processes internally. This paper discusses the feasibility of simultaneous 2-D tomographic imaging of temperature and concentrations of CO$_2$ and H$_2$O by scanning a single narrowband laser. The choice of spectroscopic lines of H$_2$O for two-tone temperature measurement is discussed around the wavelength range of 2000 nm. This region is selected as both H$_2$O and CO$_2$ spectral lines have sufficient intensity levels. The pair of wavenumbers (5005.53 and 5003.3 cm$^{-1}$) is found the best of all for temperature and H$_2$O concentration distribution and 5004.36 cm$^{-1}$ is chosen for CO$_2$. To establish the efficacy of different reconstruction algorithms, the phantoms of bimodal and concentric temperature distribution with uniform concentration were tried with four reconstruction techniques. Impressive reconstructions were achieved for distribution of temperature and concentrations of H$_2$O and CO$_2$ for same types of phantoms using Filtered Landweber and Tikhonov regularization methods for 5005.53 and 5003.3 cm$^{-1}$. Initially the imaging was tried using both fanbeam and discrete irregular beam array with 100 and 31 beams respectively. Instead of less number of beams, the later one also shows very promising result.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
