[15p-PB2-1~53] 8 Plasma Electronics（Poster)

[15p-PB2-1] Validation of translational temperature measurement using dependence on wavelength modulation depth of second harmonic signal

〇Tohru Yamada¹, Yusuke Sato¹, Makoto Matsui¹ (1.Shizuoka University)

Keywords:laser spectroscopy,high enthalpy flow

In The University of Tokyo, translational temperature measurement has been conducted using laser absorption spectroscopy (LAS) for CO₂ flow which imitates Venus reentry environment generated by laser driving plasma wind tunnel. However, due to lack of sensitivity, temperature data has not been obtained yet. Wavelength modulation spectroscopy is one of the high sensitive laser absorption spectroscopy and has been used to probe number density. In theory, it is also possible to probe translational temperature using feature of second harmonic line shape. In this study, the possibility of translational temperature measurement using wavelength modulation spectroscopy was indicated by comparing with translation temperature obtained by LAS for microwave argon plasma.