Study on the Arithmetic of Absorbance Inversion Based on Tunable Diode-Laser Absorption Spectroscopy

被引：0

作者：

Xu Zhen-yu ^{[1
]}

Liu Wen-qing ^{[1
]}

Kan Rui-feng ^{[1
]}

Zhang Yu-jun ^{[1
]}

Liu Jian-guo ^{[1
]}

Zhang Shuai ^{[1
]}

Shu Xiao-wen ^{[1
]}

Geng Hui ^{[1
]}

He Ying ^{[1
]}

Tang Yuan-yuan ^{[1
]}

机构：

[1] Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Environm Opt & Technol, Hefei 230031, Peoples R China

来源：

SPECTROSCOPY AND SPECTRAL ANALYSIS | 2010年 / 30卷 / 08期

关键词：

Absorbance; Baseline fitting; None-linear least squares method;

D O I：

10.3964/1.issn.1000-0593(2010)08-2201-04

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

Tunable diode-laser absorption spectroscopy techniques have been widely used in many regions, such as environmental monitoring and detection of industrial process, due to their high spectral resolution, high sensitivity, fast time response and non-intrusive character. It's important to obtain absorbance curve and integrated absorbance for gas concentration inversion and line strength calibration in direct-absorption spectroscopy techniques. An approach was taken to process the laser direct absorption spectrum. First a low-order polynomial baseline fitting was carried on sub-regions of the transmitted signal to eliminate the effect of diode-laser output fluctuation and obtain the absorbance curve. Then integrated absorbance can be inverted through line-shape fitting using Levenberg-Marquardt non-linear least-squares fitting method. This approach was verified by experimental processing of absorption lines of water vapor.

引用

页码：2201 / 2204

页数：4

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