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４巻２号 （2023年10月） Volume 4, Number 2 (October 2023) |
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解説: 地上衛星間レーザー長光路吸収法による大気微量ガス測定 pp. 64-76 Technical Review: Earth-to-satellite laser long-path absorption method for measuring atmospheric trace gases 杉本伸夫 Nobuo Sugimoto |
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Abstract Atmospheric trace gas measurement methods using earth-to-satellite laser long-path absorption are reviewed. An experiment using a retroreflector on a polar orbit satellite was performed in the Retroreflector In Space Experiment in 1996. Absorption spectrum of ozone in 9-μm region was successfully measured using TEA CO2 lasers. However, the optical efficiency and the efficiency of operation were low as an observation system. One way long-path absorption to a receiver on a geosynchronous satellite is much efficient. Multiplexing of the measurements from multiple ground stations is also possible using time sharing of pulsed integrated path differential absorption(IPDA) method. The use of dual comb spectroscopy would be also possible, though multiplexing of ground stations is not possible. The geosynchronous satellite system can provide continuous column concentration data over the ground stations. The data will be complementary to space borne IPDA lidars and passive sensors, and also useful for validation of passive sensors. |
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キーワード: レーザー長光路吸収，大気微量ガス，人工衛星，長光路差分吸収，デュアルコム分光 Key Words: Laser Long-Path Absorption, Atmospheric Trace Gases, Satellite, Integrated Path Differential Absorption, Dual Comb Spectroscopy |