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
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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.
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Michael Fernez, Andreas Karpf, 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); doi: 10.1117/12.2179501; https://doi.org/10.1117/12.2179501
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