Studies of the Interaction of 8 km/s Oxygen Atoms with Selected Materials

Caledonia, G. E.; Krech, R. H.

doi:10.4271/901411

Cited by 3 publications

(1 citation statement)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3) This source was equivalent to that called Physical Sciences Inc. (PSI)-type source. 4) Aerogel samples were exposed to hyperthermal atomic oxygen beam (approximately 5 eV in translational energy) with fluence of 3.0×10 20 atoms/cm 2 (Kapton equivalent fluence 5) ). This fluence was equivalent to that of #3 Aerogel in SM/MPAC (2.7×10 20 ～3.1×10 20 atoms/cm 2 ).…”

Section: Experimental Procedures 21 Ao Irradiationmentioning

confidence: 99%

Effect of Atomic Oxygen and Ultraviolet Rays Irradiation to Aerogel

Yamanaka

Kimoto

2009

Trans. JSASS Space Tech. Japan

View full text Add to dashboard Cite

Japan Aerospace Exploration Agency (JAXA) deployed three identical Micro-Particles Capturer (MPAC) units on the exterior of the Russian Service Module (SM) on the International Space Station (ISS). MPAC is a passive experiment designed to evaluate micrometeoroids and space debris environment on ISS orbit. Silica aerogels were mounted on MPAC units to capture those particles. However, it was found that the surface of silica aerogel had been altered by space environment during the experiment. Therefore, we evaluated the effects of atomic oxygen and ultraviolet rays on silica aerogel. The experimental results suggested that AO caused small cracks on silica aerogel surface, however, surface morphological feature observed in silica aerogel on SM/MPAC could not be reproduced by AO or UV-exposures. Contribution of severe contamination forming such surface texture was suggested.

show abstract

Section: Experimental Procedures 21 Ao Irradiationmentioning

confidence: 99%

Effect of Atomic Oxygen and Ultraviolet Rays Irradiation to Aerogel

Yamanaka

Kimoto

2009

Trans. JSASS Space Tech. Japan

View full text Add to dashboard Cite

show abstract

Atomic Oxygen in Low Earth Orbits, a Retrospective Review Study

Mahmoud¹,

Elfiky²,

Robaa³

et al. 2023

Kosm. nauka tehnol.

View full text Add to dashboard Cite

The article presents a retrospective review of atomic oxygen (AO) research in low Earth orbit (LEO).The space environment of LEO is a barrier to all satellites passing through it. Several of its constituent parts pose a great danger to satellite materials and subsystems. Such orbits are convenient for remote sensing and experimental satellites. In order to maintain the operational level of spacecraft, it is necessary to carry out thorough studies of the LEO environment and its components. AO, which is a hyperactive state of oxygen, is considered one of the most dangerous components of the LEO environment. It can react with many materials and thereby change the physical, optical and mechanical properties that affect the functionality of the satellite. To maintain the satellite in its orbit with a certain margin of reliability, it is necessary to reduce the aggressive influence on it of the environmental components of LEO. Predicting the impact of AO on materials that will be used in space ensures their correct selection. The work provides some recommendations for the creation of AO facilities for testing materials exposed to the aggressive influence of the space environment.

show abstract

Effect of Atomic Oxygen Exposure on Surface Resistivity Change of Spacecraft Insulator Material

Mundari

Khan

Chiga

et al. 2011

AEROSPACE TECHNOLOGY JAPAN

View full text Add to dashboard Cite

Spacecraft surface charging can lead to arcing and a loss of electricity generation capability in solar panels or even loss of a satellite. The charging problem may be further aggravated by atomic oxygen (AO) exposure in Low Earth orbits, which modifies the surface of materials like polyimide, Teflon, anti-reflective coatings, cover glass etc, used on satellite surfaces, affecting materials properties, such as resistivity, secondary electron emissivity and photo emission, which govern the charging behavior. These properties are crucial input parameters for spacecraft charging analysis. To study the AO exposure effect on charging governing properties, an atomic oxygen exposure facility based on laser detonation of oxygen was built. The facility produces AO with a peak velocity value around 10-12km/s and a higher flux than that existing in orbit. After exposing the polyimide test material to the equivalent of 10years of AO fluence at an altitude of 700-800km, surface charging properties like surface resistivity and volume resistivity were measured. The measurement was performed in a vacuum using the charge storage decay method at room temperature, which is considered the most appropriate for measuring resistivity for space applications. The results show that the surface resistivity increases and the volume resistivity remains almost the same for the AO exposure fluence of 5.4 x 10 18 atoms cm-2 .

show abstract

Studies of the Interaction of 8 km/s Oxygen Atoms with Selected Materials

Cited by 3 publications

References 8 publications

Effect of Atomic Oxygen and Ultraviolet Rays Irradiation to Aerogel

Effect of Atomic Oxygen and Ultraviolet Rays Irradiation to Aerogel

Atomic Oxygen in Low Earth Orbits, a Retrospective Review Study

Effect of Atomic Oxygen Exposure on Surface Resistivity Change of Spacecraft Insulator Material

Contact Info

Product

Resources

About