Results of contamination/degradation measurements on thermal controlsurfaces of an operational satellite

Curran, D.; Millard, Jerry M.

doi:10.2514/6.1977-740

Cited by 7 publications

(3 citation statements)

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“…This is also assumed to be the cause for the degradation of many American spacecraft, both geostationary and Earth orbiting. 2 ' 11 Although the mirrors are of the nonconductive quartz type, severe electrostatic discharges are unlikely because no effect in the spacecraft which could be traced back to electrical interference of an arc discharge has been observed in the first two years.…”

Section: Interpretation Of Resultsmentioning

confidence: 98%

OTS: Two Years of Thermal Control Experience in Orbit

Gulpen¹,

Bouchez

1982

Journal of Spacecraft and Rockets

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Since 1978 a thermal in-orbit test has been performed every three months with the geostationary, three-axis stabilized communication spacecraft OTS-2. By direct comparison and through computer-aided analysis the initial performance of the thermal subsystem and its variation during operation has been observed. From the measured temperatures and operational data, the degradation of thermal control surfaces, in particular that of the second-surface-mirror radiators, has been determined. Nomenclature t, t 0 =time o:= absorptivity AT = temperature deviation o = standard deviation

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Section: Interpretation Of Resultsmentioning

confidence: 98%

OTS: Two Years of Thermal Control Experience in Orbit

Gulpen¹,

Bouchez

1982

Journal of Spacecraft and Rockets

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“…clean mirror (2) where Afl dean mirror is the contamination from all other factors. Figure 4 shows the degradation due to the PDPS coating.…”

Section: Resultsmentioning

confidence: 99%

“…2 The model consists of 23 nodes of which several are boundary nodes, external surfaces of the satellite that have a view of the calorimeter. The seasonal effects of solar heat flux and orbit inclination are included in the model.…”

Section: Calorimeter Data Analysis Methodsmentioning

confidence: 99%

Calorimetric measurements of thermal control surfaces at geosynchronous orbit

Anderson¹,

Hattar²

1988

Journal of Thermophysics and Heat Transfer

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Calorimeter data for up to 18,000 equivalent sun-hours are presented for a.number of satellite thermal control surfaces. This has been an ongoing study by Aerojet ElectroSystems. Solar absorptance values as a function of time were collected at geosynchronous orbit on samples of zinc orthotitanate paint, silver-alumina-silica, silvered Teflon, aluminized Teflon, silica cloth, and clean second-surface mirrors. Over 6000 equivalent sunhours of calorimeter data were also collected on precontaminated second-surface mirror samples (also on-orbit). A useful collection of solar absorptance degradation equations is the result. These equations are of major significance in predicting satellite useful life. Nomenclature t -time T = temperature a m -maximum solar absorptance a 0 = initial solar absorptance a s = solar absorptance £ = emissivity r = time constant

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Analysis of Contamination Degradation of Thermal Control Surfaces on Operational Satellites

1984

Spacecraft Contamination: Sources and Prevention

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Results of contamination/degradation measurements on thermal controlsurfaces of an operational satellite

Cited by 7 publications

References 0 publications

OTS: Two Years of Thermal Control Experience in Orbit

OTS: Two Years of Thermal Control Experience in Orbit

Calorimetric measurements of thermal control surfaces at geosynchronous orbit

Analysis of Contamination Degradation of Thermal Control Surfaces on Operational Satellites

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