Degradation of solar absorptance of indigenous W-117 white paint on INSAT-3A C-band reflector in geostationary orbit

S. Rajesha Kumar, Amrit Ambirajan, Shrinivas V. Huilgol, Dinesh Kumar

Research output: Contribution to journalArticlepeer-review

Abstract

In geostationary orbit, the reflectors are exposed to highly varying solar flux environments. As a part of thermal design for the INSAT-3A C-band west reflector, the front surface of the reflector is coated with indigenously developed TiO2 based W-117 white paint. To predict the operating temperature of the reflector, the thermo-optical properties (solar absorptance and infrared emittance) of the coatings are required. It is also important to know how those properties are going to degrade in geostationary orbit throughout the life of the spacecraft due to exposure to UV radiation, high-energy protons and electrons, low energy solar wind protons and contamination from other parts of the spacecraft. Based on correlating on-orbit temperature data with a thermal mathematical model of the reflector, it was observed that the solar absorptance of the reflector white paint is much higher than expected at deployment and increases with time. A correlation is presented that relates the reflector white paint solar absorptivity with days from deployment.

Original languageEnglish
Pages (from-to)40-50
Number of pages11
JournalJournal of Spacecraft Technology
Volume20
Issue number1
StatePublished - 1 Jan 2010
Externally publishedYes

Keywords

  • Degradation
  • INSAT-3A
  • Reflector
  • Solar absorptance
  • Thermal control
  • White paint

ASJC Scopus subject areas

  • Aerospace Engineering

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