Abstract
A new spectroscopic method using a multimode tunable blue diode laser and direct absorption spectroscopy is developed to detect trace amount of nitrogen dioxide (NO2) gas. The method produces distinctive signatures for NO2 absorption that are utilized to accurately measure the gas concentration. The NO2 signatures are obtained by measuring the transmission through a calibrated NO2 gas sample as a function of laser injection current at a fixed laser temperature. These transmission curves are also calculated from the NO2 absorption cross section and laser emission spectra. The measured and calculated transmission curves are found to agree reasonably well within 5%. In this study, two different blue diode lasers emitting around 445 nm are investigated. For both lasers, a detection limit of about 0.1 ppm can be achieved in a 40-cm long gas cell under standard atmospheric conditions.
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Acknowledgements
This work was supported by the Deanship of Scientific Research at King Fahd University of Petroleum & Minerals under the Internal Research grant number RG181004.
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Aljalal, A., Altanany, S., Gasmi, K. et al. Detection of nitrogen dioxide with tunable multimode blue diode Lasers. Appl. Phys. B 127, 86 (2021). https://doi.org/10.1007/s00340-021-07633-6
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DOI: https://doi.org/10.1007/s00340-021-07633-6