Detection of trace amount of NO2 gas using tunable blue laser diode

Abdulaziz Aljalal; Sameh Altanany; Khaled Gasmi; Watheq Al-Basheer; Morad Hamad

doi:10.1117/12.2264513

16 May 2017 Detection of trace amount of NO₂ gas using tunable blue laser diode

Abdulaziz Aljalal, Sameh Altanany, Khaled Gasmi, Watheq Al-Basheer, Morad Hamad

Proceedings Volume 10231, Optical Sensors 2017; 102311E (2017) https://doi.org/10.1117/12.2264513
Event: SPIE Optics + Optoelectronics, 2017, Prague, Czech Republic

Abstract

Nitrogen dioxide, one of the main air pollutants, has strong light absorption cross section in the blue region of the optical spectrum. Recent availability of blue laser diodes provides possibility of detecting NO₂ in open-air paths with very low detection limits. However, in the blue region, the sharp features of the NO₂ spectrum is relatively broad with typical width of tenths of nanometer. This poses a serious challenge for implementing traditional direct or wave-modulated tunable diode laser absorption spectroscopy. In this study, we report the usage of a blue laser diode with multi longitudinal modes tuned over about one nanometer in detecting trace amount of NO₂ gas. Details of the setup and its optimization will be presented along with a comparison of its performance with other NO₂ detection optical methods.

Citation Download Citation

Abdulaziz Aljalal, Sameh Altanany, Khaled Gasmi, Watheq Al-Basheer, and Morad Hamad "Detection of trace amount of NO₂ gas using tunable blue laser diode", Proc. SPIE 10231, Optical Sensors 2017, 102311E (16 May 2017); https://doi.org/10.1117/12.2264513

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