A formaldehyde trace gas sensor based on a thermoelectrically cooled CW-DFB quantum cascade laser

被引：26
作者：
Li, Jingsong [1 ,2 ]
Parchatka, Uwe [1 ]
Fischer, Horst [1 ]
机构：
[1] Max Planck Inst Chem, Dept Atmospher Chem, D-55128 Mainz, Germany
[2] Anhui Univ, Key Lab Optoelect Informat Acquisit & Manipulat, Minist Educ, Hefei 230601, Peoples R China
来源：
ANALYTICAL METHODS | 2014年 / 6卷 / 15期
关键词：
ABSORPTION-SPECTROSCOPY; NITROUS-OXIDE; SPECTROMETER; METHANE; OPERATION; SYSTEMS; CO;
D O I：
10.1039/c3ay41964a
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
We report the development of a trace gas sensor for the detection of atmospheric formaldehyde utilizing a thermoelectrically cooled distributed-feedback quantum cascade laser operating in continuous-wave mode at 5.68 mu m. Wavelength modulation spectroscopy was combined with second harmonic detection and zero air based background subtraction techniques to enhance both detection sensitivity and precision to similar to 2.5 ppbv for H2CO measurement with an integration time of less than 1 second and a 36 m optical path length. A novel analysis technique based on wavelet transform for noise reduction was successfully applied to improve the sensor performance, yielding sub-ppb measurement precision without reducing the fast temporal response.
引用
收藏
页码：5483 / 5488
页数：6
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