Generation and diagnostics of atmospheric pressure CO2 plasma by laser driven plasma wind tunnel

Abstract

Atmospheric pressure CO2 plasma was generated by a laser driven plasma wind tunnel. At an ambient pressure of 0.38 MPa, a stable plasma was maintained by a laser power of 1000 W for more than 20 min. The translational temperature was measured using laser absorption spectroscopy with the atomic oxygen line at 777.19 nm. The measured absorption profiles were analyzed by a Voigt function considering Doppler, Stark, and pressure-broadening effects. Under the assumption of thermochemical equilibrium, all broadening effects were consistent with each other. The measured temperature ranged from 8500 K to 8900 K.

Plasma Atomization of Strontium Chloride Powder by a Supersonic Plasma Jet and Measurement of Its Efficiency Using Diode Laser Absorption Spectroscopy

“…The absorption coefficient can be described using the following equation where k 0 is the absorption coefficient at the center frequency, σ is the standard deviation of the Gaussian function, Δν L is the sum of the half width at half-maximum of the Lorentz function, and δ is the integration variable. 27 In addition, considering the isotope effects of four natural isotopes (i.e., 84 Sr, 86 Sr, 87 Sr, and 88 Sr), the absorption coefficient can be expressed by where Δν i is the isotope shift, while R i denotes the abundance ratio. These parameters are summarized in Table S1 .…”

Temperature Measurement of HEK-X Expansion Tube Flow by Laser Absorption Spectroscopy

“…The target absorption line is one of the A-bands of the oxygen molecule at 763 nm, whose wavelength can be covered by a diode laser. The absorption profile is the Voigt profile expressed as 5) kð…”

Atomic-Oxygen-Flow Generation by Laser-Driven Plasma Wind Tunnel as Low-Earth-Orbit-Environment Simulator

“…To overcome the abovementioned problems, we previously developed a laser-driven wind tunnel that would act as a high-density atomic oxygen generator, by producing laser-sustained plasma (LSP) [16,17]. In LSP, the plasma is sustained by absorbing the power of a focused laser beam through an inverse bremsstrahlung radiation process between electrons and ions.…”