19 May 2006 Phase insensitive frequency modulation LIDAR for long distance CO2 monitoring
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Abstract
Gas monitoring over long distances using Frequency Modulation (FM) spectroscopy require phase insensitive detection scheme because of the severe scintillation problem. We report our effort to develop a long working distance CO2 monitoring LIDAR that uses phase insensitive Two-Tone Frequency Modulation (TTFM) spectroscopy technique. We could detect 10-4 single pass absorption, and could detect 1ppm CO2 level change in normal air.
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Andrei Deev, Sheng Wu, "Phase insensitive frequency modulation LIDAR for long distance CO2 monitoring", Proc. SPIE 6214, Laser Radar Technology and Applications XI, 62140A (19 May 2006); doi: 10.1117/12.665374; https://doi.org/10.1117/12.665374
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