High-accuracy sinewave-scanned direct absorption spectroscopy

被引：51
作者：
Du, Yanjun [1 ]
Peng, Zhimin [1 ]
Ding, Yanjun [1 ]
机构：
[1] Tsinghua Univ, Dept Energy & Power Engn, State Key Lab Power Syst, Beijing 100084, Peoples R China
来源：
OPTICS EXPRESS | 2018年 / 26卷 / 22期
基金：
中国国家自然科学基金; 国家重点研发计划;
关键词：
WAVELENGTH-MODULATION SPECTROSCOPY; DIODE-LASER MEASUREMENTS; DEPENDENT LINESHAPE PARAMETERS; H2O TRANSITIONS; WATER-VAPOR; LINE-SHAPE; LINESTRENGTH; ABSORBENCY; DOPPLER; SENSOR;
D O I：
10.1364/OE.26.029550
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A novel method with high accuracy and easy implementation was proposed based on the sinewave-scanned direct absorption spectroscopy (DAS) in this paper. A fitting routine in the time domain was developed to simultaneously deduce the baseline and more importantly, absorbance through the explicit baseline expression offered by the sinewave scan. This method effectively solves the difficulties of baseline determination and provides more accurate wavelength calibration compared with conventional DAS. The accuracy and performance with narrow scans and high frequency were experimentally verified using CO transition at 4300.699 cm(-1), from which the inferred line strength agrees well with HITRAN 2016. Meanwhile, a more accurate N-2 collisional broadening was provided and the speed-dependent collisional broadening coefficient of this transition was reported for the first time. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
引用
收藏
页码：29550 / 29560
页数：11
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