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30 November 2006 Feasibility study of microwave modulation DIAL system for global CO2 monitoring
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A new concept of DIAL (DIfferential Absorption Lidar) system for global CO2 monitoring using microwave modulation is introduced. This system uses quasi-CW lights which are intensity modulated in microwave region and receives a backscattered light from the ground. In this system, ON/OFF wavelength laser lights are modulated with microwave frequencies, and received lights of two wavelengths are able to be discriminated by modulation frequencies in electrical signal domain. Higher sensitivity optical detection can be realized compared with the conventional microwave modulation lidar by using direct down conversion of modulation frequency. The system also has the function of ranging by using pseudo-random coding in modulation. Fiber-based optical circuit using wavelength region of 1.6 micron is a candidate for the system configuration. After the explanation of this configuration, feasibility study of this system on the application to global CO2 monitoring is introduced.
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Yoshihito Hirano, Shumpei Kameyama, Shinichi Ueno, Nobuo Sugimoto, and Toshiyoshi Kimura "Feasibility study of microwave modulation DIAL system for global CO2 monitoring", Proc. SPIE 6409, Lidar Remote Sensing for Environmental Monitoring VII, 64090A (30 November 2006);

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