レーザー吸収分光法における吸収飽和の並進温度測定への影響

概要

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Absorption saturation appears in laser absorption spectroscopy when laser intensity becomes so high that the laser disrupts a population of absorbing particles in plasma. In this study, influences of saturation on translational temperature and integrated absorption coefficient measurement were investigated. An argon discharge tube was used and ArI absorption lines at 840.82nm and 842.46nm are examined. As a result, a variation of integrated absorption coefficient caused by the saturation phenomenon is well agreed to a theoretical curve. As for the translational temperature, if the laser intensity is smaller than a saturation laser intensity by an order of magnitude, true translational temperature would be obtainable.
プラズマ応用科学会,東京大学大学院,東京大学工学部,Department of Advanced Energy, The University of Tokyo,Department of Aerospace and Astronautics, The University of Tokyoの論文