Real-time measurement of the NO2 concentration in ambient air using a multi-mode diode laser and cavity enhanced multiple line integrated absorption spectroscopy

Michael Fernez; Andreas Karpf; Gottipaty N. Rao

doi:10.1117/12.2179501

13 May 2015 Real-time measurement of the NO₂ concentration in ambient air using a multi-mode diode laser and cavity enhanced multiple line integrated absorption spectroscopy

Michael Fernez, Andreas Karpf, Gottipaty N. Rao

Author Affiliations +

Proceedings Volume 9486, Advanced Environmental, Chemical, and Biological Sensing Technologies XII; 94860H (2015) https://doi.org/10.1117/12.2179501
Event: SPIE Sensing Technology + Applications, 2015, Baltimore, MD, United States

Abstract

We report on the measurement of the NO₂ concentration in ambient air using a highly sensitive trace gas detector based on a simplified design that uses a multi-mode diode laser and cavity enhanced multiple line integrated absorption spectroscopy. The broad frequency range of the laser covers a large number of absorption lines of NO₂ and excites a large number of cavity modes. The off-axis cavity arrangement reduces the detector’s susceptibility to vibration. The detector was calibrated using known concentrations of NO₂ in zero air and used to measure the concentration of NO₂ in ambient air in our laboratory. A sensitivity of 75 ppt was achieved.

Citation Download Citation

Michael Fernez, Andreas Karpf, and Gottipaty N. Rao "Real-time measurement of the NO₂ concentration in ambient air using a multi-mode diode laser and cavity enhanced multiple line integrated absorption spectroscopy", Proc. SPIE 9486, Advanced Environmental, Chemical, and Biological Sensing Technologies XII, 94860H (13 May 2015); https://doi.org/10.1117/12.2179501

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