THE DEVELOPMENT OF DIMENSIONALLY STABLE CFRP CAMERA STRUCTURE Deoggyu Lee1, Eungshik Lee1, Suyoung Chang1, Andreas Kasemann2, Dietmar Scheulen2, Tom Butters2 1 Korea Aerospace Research Institute, 45 Eoeun-Dong, Daejeon, 305-333, South Kore
- Paper number
IAC-09.C2.2.1
- Author
Dr. deoggyu lee, Korea Aerospace Research Institute, Korea, Republic of
- Year
2009
- Abstract
The main instrument of the Earth Observation satellite KOMPSAT 3 (Korean Multi-Purpose Satellite 3) is a large optical camera consisting of mirrors out of ZERODUR Primary Mirror, a high performance CFRP structure and a Focal Plane Assembly with 2 panchromatic and 4 multi-spectral channels from 450 to 900 nm wavelength. The Ø 1.2 x 2 m-sized CFRP camera structure has been developed for this project and confirmed achieving an extreme dimensional stability of 0.2 µm/1K and simultaneously a Coefficient of Moisture Expansion of nearly Zero for the most critical distance between Primary and Secondary Mirror through very tight and accurate control for the fibre angle during the lay-up, resin content and other manufacturing parameters. For the verification of the performances the usual environmental test procedures have been applied (thermal cycling, TV-test, vibration and shock test), but they have been extended by high precision absolute dimensional measurements using 3D-measurement machine before and after the tests and stability measurements under temperature loads and vacuum. For the dimensional stability measurements a dedicated measurement device with ZERODUR rods and optical sensors has been designed and established. It provides accuracy in the sub-µm range, even under temperature changes and vacuum. The paper mainly focuses on the CFRP camera structure, the manufacturing of the hardware and the tests for verification. Contact author: Deoggyu Lee, Korea Aerospace Research Institute, 45 Eoeun-Dong, Daejeon, 305-333, South Korea Phone: 82-42-860-2095, Fax: 82-42-860-2603, Email: dglee@kari.re.kr Preferred form of presentation: Presentation Mode
- Abstract document
- Manuscript document
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