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

Matsui, Makoto; Yoneda, S; Komurasaki, Kimiya; Yamagiwa, Yoshiki; Arakawa, Yoshihiro

doi:10.2514/1.j052991

Cited by 14 publications

(4 citation statements)

References 19 publications

(19 reference statements)

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“…The high-temperature gas effect refers to the phenomena and effects of gas under extremely high-temperature conditions in aerospace, energy, combustion, and other areas [1,2]. The primary objective of high-temperature gas-effect investigation is to enhance the design of flow fields and improve prediction models by acquiring key technical parameters that delineate flow-field operations.…”

Section: Introductionmentioning

confidence: 99%

Generating a Sustained Oxygen-Stable Atomic Concentration in a High-Temperature Gas Effect Investigation

Zhi,

Chang,

Huang

et al. 2023

Micromachines

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Modulated laser absorption spectroscopy is an ideal technique for evaluating flow-field parameters and determining flow-field quality by measuring the atoms dissociated in high-temperature environments. However, to obtain the absolute number density of atoms in the flow field, it is necessary to compare the measured modulated absorption spectroscopy signal with a known atomic concentration and establish a quantitative relationship through concentration calibration. Nevertheless, it remains a challenging task to prepare transient atomic samples with known concentrations that meet the calibration requirements. This study utilized the alternating-current glow discharge technique to dissociate oxygen in the air flow, resulting in the continuous generation of oxygen atoms. The absolute number densities of the generated oxygen atoms were determined by measuring the direct absorption spectra of centered on 777 nm for oxygen atoms. The number densities of the generated atoms were finely tuned by adjusting the discharge parameters. Throughout the 120-min continuous operation of the discharge system, the concentration of excited-state oxygen atoms remained stable within the range of (2.51 ± 0.02) × 108 cm−3, demonstrating the remarkable stability of the transient atomic concentration generated by the glow discharge plasma. This observation suggests that the generated atoms can be utilized as a standardized atomic sample of known concentration for absolute concentration calibration purposes.

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Section: Introductionmentioning

confidence: 99%

Generating a Sustained Oxygen-Stable Atomic Concentration in a High-Temperature Gas Effect Investigation

Zhi,

Chang,

Huang

et al. 2023

Micromachines

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“…In a previous study, LSPs using argon (Ar), oxygen (O), and hydrogen (H) were generated using a carbon-dioxide (CO 2 ) laser, and the thruster performance was evaluated. [13][14][15] However, the plug-in energy conversion efficiency of CO 2 lasers is as low as 10%. In addition, they are large and require regular maintenance.…”

Section: Introductionmentioning

confidence: 99%

Generation of Argon Laser-Sustained Plasma using Diode Laser

Okamoto

Ishikawa

Matsui

2023

Trans. Japan Soc. Aero. S Sci.

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Argon laser-sustained plasma (LSP) was generated using a 4-kW-class diode laser at pressures of 1.55-2.00 MPa. It was found that there is a tendency of the minimum laser power for LSP generation to decrease from 4,200 W to 2,850 W as the pressure increases. The temperature estimated based on emission spectroscopy was approximately 12,000 K for the variation of pressure and the laser power of 4,350 W. Because the estimated absorption coefficient increases with pressure assuming the inverse bremsstrahlung process, the decrease in minimum laser power as pressure increases pressure is consistent with the increase in the absorption coefficient. There was no significant tendency in temperature change as pressure increased. Furthermore, the inverse bremsstrahlung coefficient tended to increase slightly as pressure increased. This is because the electron number density increases as pressure increases at the same temperature. Therefore, the laser power for LSP generation decreases as pressure increases.

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“…Laser absorption spectroscopy (LAS) is a practical diagnostic method used for measuring gas temperature, number density, and flow velocity [1][2][3][4][5][6][7]. It can be applied to optically thick targets and enables the absolute number density to be determined without calibration, unlike emission spectroscopy and laserinduced fluorescence (LIF) [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Enhancement limit of sensitivity in laser absorption spectroscopy using a multipass cell composed of spherical concave mirrors

Matsui

Kobayashi²,

Yasui³

2022

Meas. Sci. Technol.

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The upper limit of sensitivity enhancement in a multipass process was investigated. In the calculation of 3.7×1013 ray-trace analysis, the sensitivity enhancement was increased to 13,510 for the mirror diameter of 75 mm with the mirror diameter. In the experiment, the sensitivity was enhanced by a factor of 1790 ± 160 for an effective mirror diameter of 50 mm, which was one-third of the numerical prediction. The lower enhancement could be attributed to the insufficient spatial and angular resolution of alignment optics. Therefore, this multipass cell has the potential to improve the sensitivity by three to four orders of magnitude.

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

Cited by 14 publications

References 19 publications

Generating a Sustained Oxygen-Stable Atomic Concentration in a High-Temperature Gas Effect Investigation

Generating a Sustained Oxygen-Stable Atomic Concentration in a High-Temperature Gas Effect Investigation

Generation of Argon Laser-Sustained Plasma using Diode Laser

Enhancement limit of sensitivity in laser absorption spectroscopy using a multipass cell composed of spherical concave mirrors

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