Diagnostics of Plasma Torch Flow by Cavity Enhanced Absorption Spectroscopy
キャビティエンハンスト吸収分光法によるプラズマトーチ気流診断

Hiroki Takayanagi, Makoto Matsui, Kimiya Komurasaki, Hideaki Ochimizu, Yoshihiro Arakawa
2007 JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES  
The cavity enhanced absorption spectroscopy using a tunable diode laser was applied to plasma torch diagnostics. Using cavity mirrors with 99.95% reflectance, the sensitivity was successfully enhanced by three orders of magnitude compared with the conventional single-pass laser absorption spectroscopy. With a 0.6 m distance cavity, the spatial resolution of less than 1 mm was achieved. The deviation of deduced temperature was below 5% when ten profiles were averaged. Total amount of data
more » ... ount of data acquisition needed for a given plume section was estimated at 100 M Sample. The torch plume was found in nonequilibrium electronic excitation state.
doi:10.2322/jjsass.55.324 fatcat:oot6mmkhmvbgxfwcbgi6mf43g4