Material selection of 3.5-meter segmented mirror for geostationary Earth observation satellite

T. Kamiya; S. Yasuda; A. Okamoto; S. Sato; H. Ueno; T. Mizutani

doi:10.1117/12.2529106

9 September 2019 Material selection of 3.5-meter segmented mirror for geostationary Earth observation satellite

T. Kamiya, S. Yasuda, A. Okamoto, S. Sato, H. Ueno, T. Mizutani

Proceedings Volume 11116, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II; 111160R (2019) https://doi.org/10.1117/12.2529106
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

As part of leading research for future space missions, we have been conducting a feasibility study on an optical imager system assumed to be mounted on a geostationary satellite for instantaneous Earth observation as needed. The target for ground sampling resolution was less than 10 m from geostationary orbit, and the primary mirror was set to a diameter of 3.5 m based on our previous conceptual study. Moreover, the primary mirror was conceptually designed with cuttingedge technologies such as segmented mirror technology for scalability to larger sizes in the future. The main technical challenges in achieving such a large optical system entailed reducing the primary mirror weight and minimizing dimensional changes in the space environment. Optical material selection was a particularly key consideration in defining the optical system performance. Therefore, a trade-off study was conducted on the selection of materials for the segmented primary mirror. The thermal deformation behaviors of certain low thermal expansion materials as mirror substrates were analytically compared under the assumed unsteady and inhomogeneous thermal conditions in geostationary orbit, in consideration of the deterioration induced by radiation.

Conference Presentation

Citation Download Citation

T. Kamiya, S. Yasuda, A. Okamoto, S. Sato, H. Ueno, and T. Mizutani "Material selection of 3.5-meter segmented mirror for geostationary Earth observation satellite", Proc. SPIE 11116, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II, 111160R (9 September 2019); https://doi.org/10.1117/12.2529106

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