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A new line-shape asymmetry model for wavelength modulation spectroscopy in gaseous flows

机译：气流中波长调制光谱的新线形不对称模型

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摘要

This communication reports technical notes on the development and application of an automated line-shape fitting procedure for wavelength modulation spectroscopy (WMS). Near-infrared transitions of carbon dioxide (CO_(2)) around 1573 nm were measured in vertical cold (nonreacting) flow of CO_(2) at atmospheric pressure using WMS with demodulation at second harmonic frequency. Semi-empirical model based on the set of so-called Gabor functions was developed and parameters of Lorentzian line-shape profile and its asymmetry resulting from simultaneous frequency and amplitude response of the current-modulated semiconductor laser were determined. Nonlinear least-square fitting procedure employing differential evolution algorithm was successfully utilized for performing this task. Line-shape fitting procedure enabling efficient signal de-noising and background subtraction of wavelength modulation spectra was implemented into an open-source code.
机译：该通讯报告了有关波长调制光谱（WMS）的自动线形拟合程序的开发和应用的技术说明。使用WMS在二次谐波频率下进行解调，在大气压力下CO_（2）的垂直冷（非反应）流中测量了1573 nm附近的二氧化碳（CO_（2））的近红外跃迁。建立了基于Gabor函数集的半经验模型，确定了电流调制半导体激光器的频率和幅度响应同时引起的洛伦兹线形轮廓参数及其不对称性。使用差分进化算法的非线性最小二乘拟合程序已成功地用于执行此任务。线形拟合程序可实现有效的信号降噪和波长调制光谱的背景减法，已被实现为一个开源代码。

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