Analysis of periodic temporal changes in the spectral signature of IR sources by modeling of spectral artifacts in FTIR systems

IF 2.3 3区 物理与天体物理 Q2 OPTICS Journal of Quantitative Spectroscopy & Radiative Transfer Pub Date : 2024-12-17 DOI:10.1016/j.jqsrt.2024.109320
David Santalices , Juan Meléndez , Susana Briz
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Abstract

Periodic fluctuations in the incoming spectrum to a Fourier-transform infrared (FTIR) spectrometer often result in spectral artifacts that can compromise quantitative measurements. This study presents a novel method that relaxes the conventional assumption of uniform fluctuations across all frequencies, by modeling the radiance fluctuations with a Fourier series expansion with wavenumber-dependent coefficients. By limiting the incoming spectral bandwidth with an interference filter, it is possible to retrieve the artifact-free average spectrum and to obtain the temporal evolution of the incident radiance. Experimental validation was conducted with transmittance measurements on a methane gas sample whose column density was periodically modulated. This method expands FTIR capabilities, particularly for applications involving fluctuating gases, and enhances the potential for time-resolved analysis in complex environments.
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利用FTIR系统中光谱伪影的建模分析红外光源光谱特征的周期性时间变化
傅里叶变换红外(FTIR)光谱仪的入射光谱的周期性波动通常会导致光谱伪影,从而影响定量测量。本研究提出了一种新的方法,通过用波数相关系数的傅立叶级数展开来模拟辐射波动,从而放松了所有频率均匀波动的传统假设。通过用干涉滤光片限制入射光谱带宽,可以获得无伪影的平均光谱,并获得入射辐射的时间演变。通过周期性调节柱密度的甲烷气体样品的透光率测量进行了实验验证。该方法扩展了FTIR的功能,特别是在涉及波动气体的应用中,并增强了在复杂环境中进行时间分辨分析的潜力。
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来源期刊
CiteScore
5.30
自引率
21.70%
发文量
273
审稿时长
58 days
期刊介绍: Papers with the following subject areas are suitable for publication in the Journal of Quantitative Spectroscopy and Radiative Transfer: - Theoretical and experimental aspects of the spectra of atoms, molecules, ions, and plasmas. - Spectral lineshape studies including models and computational algorithms. - Atmospheric spectroscopy. - Theoretical and experimental aspects of light scattering. - Application of light scattering in particle characterization and remote sensing. - Application of light scattering in biological sciences and medicine. - Radiative transfer in absorbing, emitting, and scattering media. - Radiative transfer in stochastic media.
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