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 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.

Ppb-level detection of nitric oxide using an external cavity quantum cascade laser based QEPAS sensor / Dong, L.; Spagnolo, Vincenzo Luigi; Lewicki, R.; Tittel, F. K.. - In: OPTICS EXPRESS. - ISSN 1094-4087. - 19:24(2011), pp. 24037-24045. [10.1364/OE.19.024037]

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

SPAGNOLO, Vincenzo Luigi;
2011-01-01

Abstract

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 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.
2011
Ppb-level detection of nitric oxide using an external cavity quantum cascade laser based QEPAS sensor / Dong, L.; Spagnolo, Vincenzo Luigi; Lewicki, R.; Tittel, F. K.. - In: OPTICS EXPRESS. - ISSN 1094-4087. - 19:24(2011), pp. 24037-24045. [10.1364/OE.19.024037]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/10078
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