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A comparative study of transient characteristics of argon and hydrogen-argon pulse modulated induction thermal plasma Hossain, M.M. Hashimoto, Y. 90303263 Tanaka, Yasunori Paul, K.C. 80135318 Sakuta, Tadahiro Copyright (C) 2002 IEEE.. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE..IEEE TRANSACTIONS ON PLASMA SCIENCE 30(1),pp.327-337 AA0066803X Solving a time-dependent two-dimensional local thermodynamic equilibrium (LTE) model simulation of Ar and Ar-H2 atmospheric pressure, a high-power RF-induction thermal plasma was performed. The effects of shimmer current level (SCL) in pulse-modulated mode and hydrogen concentrations on different flow fields were predicted. The radiation intensities of Ar I (751 nm) for different SCL were calculated from the temperature fields. For the same operating conditions as simulation, plasma was successfully generated in pulse-modulated mode and spectroscopic measurements were carried out to investigate the effects of SCL upon temporal plasma properties. Response times (rising, falling, on-delay, and off-delay time) of temporal radiation intensity were crosschecked for both experimental and simulated ones. The rising time increased gradually with the decrease of SCL, though the falling time remained almost unchanged with SCL. For example, for Ar plasma at 86 percent , 79 percent , 72 percent , 65 percent , 50 percent , and 40 percent SCL the rising times were 2.7, 3.0, 3.4, 3.4, 3.6, and 3.8 ms, respectively. And for Ar-H2 plasma (2.4 percent H2), at 87 percent , 77 percent , 72 percent , 63 percent , 55 percent , and 45 percent SCL, rising times were 2.5, 3.0, 3.0, 3.4, 3.7, 3.9, and 4.0 ms, respectively. Hydrogen inclusion slowed down the plasma response during the off-to-on pulsing transition at lower SCL and constricted the plasma axially. Finally, part of the simulated results was compared with experimental determinations and acceptable agreements were found. The discrepancies, in few cases, explicated mainly that the LTE assumption did not prevail in pulse-modulated plasma, especially around the on-pulse transition IEEE 2002-02-01 2017-10-03 eng journal article VoR http://hdl.handle.net/2297/1806 https://kanazawa-u.repo.nii.ac.jp/records/7668 https://doi.org/10.1109/tps.2002.1003877 00933813 IEEE TRANSACTIONS ON PLASMA SCIENCE 30 1 327 337 https://kanazawa-u.repo.nii.ac.jp/record/7668/files/01003877.pdf application/pdf 643.2 kB 2017-10-03