Active differential optical absorption spectroscopy for NO2 gas pollution using blue light emitting diodes

Abdulaziz Aljalal; Khaled Gasmi; Watheq Al-Basheer

doi:10.1117/12.2179139

5 May 2015 Active differential optical absorption spectroscopy for NO₂ gas pollution using blue light emitting diodes

Abdulaziz Aljalal, Khaled Gasmi, Watheq Al-Basheer

Proceedings Volume 9506, Optical Sensors 2015; 95062A (2015) https://doi.org/10.1117/12.2179139
Event: SPIE Optics + Optoelectronics, 2015, Prague, Czech Republic

Abstract

Availability of high intensity light emitting diodes in the blue region offer excellent opportunity for using them in active Differential Optical Absorption Spectroscopy (DOAS) to detect air pollution. Their smooth and relatively broad spectral emissions as well as their long life make them almost ideal light sources for active DOAS. In this study, we report the usage of a blue light emitting diode in an active DOAS setup to measure traces of NO2 gas and achieving few parts per billion detection limit for a path length of 300 m. Details of the setup will be presented along with the effects on measurement accuracy due to shifts in the measured spectra calibration and due to using theoretical instrument Gaussian function instead of the measured instrument function.

Citation Download Citation

Abdulaziz Aljalal, Khaled Gasmi, and Watheq Al-Basheer "Active differential optical absorption spectroscopy for NO₂ gas pollution using blue light emitting diodes", Proc. SPIE 9506, Optical Sensors 2015, 95062A (5 May 2015); https://doi.org/10.1117/12.2179139

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