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