21 February 2014 Research on the trace detection of carbon dioxide gas and modulation parameter optimization based on the TDLAS technology
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Abstract
Based on the technology of tunable diode laser absorption spectroscopy, modulation of the center wavelength of 2004 nm distributed feedback laser diode at a room-temperature, the second harmonic amplitude of CO2 at 2004nm can be obtained. The CO2 concentration can be calculated via the Beer-Lambert law. Sinusoidal modulation parameter is an important factor that affects the sensitivity and accuracy of the system, through the research on the relationship between sinusoidal modulation signal frequency, amplitude and Second harmonic linetype, we finally achieve the detection limit of 10ppm under 12 m optical path.
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Peng Zhao, Peng Zhao, Jun Tao, Jun Tao, Chang-rui Yu, Chang-rui Yu, Ye Li, Ye Li, } "Research on the trace detection of carbon dioxide gas and modulation parameter optimization based on the TDLAS technology", Proc. SPIE 9142, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics: Optical Imaging, Remote Sensing, and Laser-Matter Interaction 2013, 914210 (21 February 2014); doi: 10.1117/12.2055716; https://doi.org/10.1117/12.2055716
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