摘要
可调谐半导体激光吸收光谱具有高分辨、高灵敏度和快速测量等特点,已经在环境检测、工业过程检测等方面得到广泛应用。在直接吸收光谱技术中,吸光度曲线以及积分吸光度的确定对于气体浓度反演、线强校正等都有重要的作用。对激光直接吸收光谱中吸光度和吸光度积分反演算法进行了研究,采用分段多项式基线拟合方法来消除激光器光强波动的影响,得到吸光度,再用非线性拟合Levenberg-Marquardt算法进行线形拟合来获取积分吸光度。通过水气吸收谱线的检测对算法进行了验证。
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.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2010年第8期2201-2204,共4页
Spectroscopy and Spectral Analysis
基金
中国科学院知识创新工程重要方向性项目(KGCX2-YW-121-1)
中国科学院国防预研基金项目(CXJJ-09-M38)资助
关键词
吸光度
基线拟合
非线性最小二乘法
Absorbance
Baseline fitting
None-linear least squares method