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http://dx.doi.org/10.3807/KJOP.2018.29.4.166

Prediction Method for Moisture-release Surface Deformation of a Large Mirror in the Space Environment  

Song, In-Ung (Space Optics Laboratory (SOL), Department of Astronomy, Yonsei University)
Yang, Ho-Soon (Space Optics Team, Korea Research Institute of Standards and Science)
Khim, Hagyong (Space Optics Team, Korea Research Institute of Standards and Science)
Kim, Seong-Hui (Satellite Payload Development Division, Korea Aerospace Research Institute)
Lee, Hoi-Yoon (Space Optics Team, Korea Research Institute of Standards and Science)
Kim, Sug-Whan (Space Optics Laboratory (SOL), Department of Astronomy, Yonsei University)
Publication Information
Korean Journal of Optics and Photonics / v.29, no.4, 2018 , pp. 166-172 More about this Journal
Abstract
In this paper, we propose a new method to predict a mirror's surface deformation due to the stress of moisture release by a coating in the environment of outer space. We measured the surface deformation of circular samples 50 mm in diameter and 1.03 mm thick, using an interferometer. The results were analyzed using Zernike fringe polynomials. The coating stress caused by moisture release was calculated to be 152.7 MPa. This value was applied to an analytic model of a 1.25 mm thickness sample mirror, confirming that the change of surface deformation could be predicted within the standard deviation of the measurement result ($78.9{\pm}5.9nm$). Using this methodology, we predicted the surface deformation of 600 mm hyperbolic mirror for the Compact Advanced Satellite, which will be launched in 2019. The result is only $2.005{\mu}m$ of focal shift, leading to 2.3% degradation of modulation transfer function (MTF) at the Nyquist frequency, which satisfies the requirement.
Keywords
Space environment; Optical coating; Moisture expansion; Satellite optics;
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