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

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 µm) with a widely tunable, mode-hop-free external cavity QCL. For a selected NO absorption line that is free from H(2)O and CO(2) 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.

[1]  A. Kosterev,et al.  Carbon dioxide and ammonia detection using 2 μm diode laser based quartz-enhanced photoacoustic spectroscopy , 2007 .

[2]  Laurence S. Rothman,et al.  The HITRAN molecular spectroscopic database: edition of 2000 including updates through 2001 , 2003 .

[3]  A. Morse,et al.  Fundamental limits to force detection using quartz tuning forks , 2000 .

[4]  A. Kosterev,et al.  Quartz-enhanced photoacoustic spectroscopy. , 2002, Optics letters.

[5]  Frank K. Tittel,et al.  Compact portable QEPAS multi-gas sensor , 2011, OPTO.

[6]  Frank K. Tittel,et al.  QEPAS for chemical analysis of multi-component gas mixtures , 2010 .

[7]  Frank K. Tittel,et al.  NO trace gas sensor based on quartz-enhanced photoacoustic spectroscopy and external cavity quantum cascade laser , 2010 .

[8]  Lei Dong,et al.  QEPAS spectrophones: design, optimization, and performance , 2010 .

[9]  A. Kosterev,et al.  QEPAS methane sensor performance for humidified gases , 2008 .

[10]  A. Kosterev,et al.  Applications of quartz tuning forks in spectroscopic gas sensing , 2005 .

[11]  Frank K. Tittel,et al.  Current status of midinfrared quantum and interband cascade lasers for clinical breath analysis , 2010 .

[12]  Amir Sharafkhaneh,et al.  Exhaled nitric oxide parameters and functional capacity in chronic obstructive pulmonary disease , 2011, Journal of breath research.

[13]  W. Schade,et al.  Use of quantum cascade lasers for detection of explosives: progress and challenges , 2010 .

[14]  Anping Liu,et al.  Detection of nitric oxide in air with a 5.2 μm distributed-feedback quantum cascade laser using quartz-enhanced photoacoustic spectroscopy. , 2010, Optics express.