Ppb-level detection of nitric oxide using an external cavity quantum cascade laser based QEPAS sensor

被引：127

作者：

Dong, Lei ^{[1
]}

Spagnolo, Vincenzo ^{[1
,2
,3
]}

Lewicki, Rafal ^{[1
]}

Tittel, Frank K. ^{[1
]}

机构：

[1] Rice Univ, Dept Elect & Comp Engn, Houston, TX 77005 USA

[2] Univ Bari, Dipartimento Interateneo Fis, I-70126 Bari, Italy

[3] Politecn Bari, CNR IFN UOS BARI, I-70126 Bari, Italy

来源：

OPTICS EXPRESS | 2011年 / 19卷 / 24期

基金：

美国国家科学基金会;

关键词：

ENHANCED PHOTOACOUSTIC-SPECTROSCOPY;

D O I：

10.1364/OE.19.024037

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Geometrical parameters of micro-resonator for a quartz enhanced photoacoustic spectroscopy sensor are optimized to perform sensitive and background-free spectroscopic measurements using mid-IR quantum cascade laser (QCL) excitation sources. Such an optimized configuration is applied to nitric oxide (NO) detection at 1900.08 cm(-1) (5.26 mu m) with a widely tunable, mode-hop-free external cavity QCL. For a selected NO absorption line that is free from H2O and CO2 interference, a NO detection sensitivity of 4.9 parts per billion by volume is achieved with a 1-s averaging time and 66 mW optical excitation power. This NO detection limit is determined at an optimal gas pressure of 210 Torr and 2.5% of water vapor concentration. Water is added to the analyzed mixture in order to improve the NO vibrational-translational relaxation process. (C) 2011 Optical Society of America

引用

页码：24037 / 24045

页数：9

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