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Refractive-index changes caused by proton radiation in silicate optical glasses.
We have studied experimentally, by using a differential interferometric technique, the effect of proton radiation on the refractive index of commercial (Schott) silicate crown glasses, BK7 and LaK9,Expand
Development of the SOFIA silicon carbide secondary mirror
The SOFIA telescope is ajoint NASA-DLR project for a 2.5 m airborne Stratospheric Observatory for IR Astronomy to be flown in a specially adapted Boeing 747 SP plane, Kayser-Threde being resopinsibleExpand
Measuring space radiation impact on the characteristics of optical glasses: measurement results and recommendations from testing a selected set of materials
Radiation sensitivity of glass is a general concern for the designer of Space optical instruments. ASTRIUM, in cooperation with SCK-CEN, has conducted a study (under ESA sponsorship) to define theExpand
Ion beam figuring of SiC mirrors provides ultimate WFE performances for any type of telescope
Matra Marconi Space (MMS) has designed, manufactured and tested a (Phi) 200 mm aspherical mirror to (lambda) /100 rms WFE for the purpose of a telescope demonstrator which both structure and mirrorsExpand
Space radiation sensitivity of glasses: first results toward a comprehensive dose coefficients database
Radiation sensitivity of glass is a general concern for the designer of space optical instruments. It has been proposed that the effect of radiation can be described within the dose coefficientExpand
Radiation impact on spaceborne optics: the dose coefficients approach
During the past 30 years of development of Space optical instrumentation for such missions as METEOSAT, SPOT, HIPPARCOS and SILEX with ESA and CNES, Matra Marcon Space (MMS) has conducted extensiveExpand
Optical Design Of The Hipparcos Telescope
The design and the development of the HIPPAR-COS payload all reflective Schmidt telescope have been driven by the highly demanding challenge of reaching an accuracy of 2 milli-arcseconds (1.E-8Expand
SiC telescope demonstrator (mirrors and structure): optomechanical performances
Matra Marconi Space (MMS) has designed, built, aligned and tested a 200-mm bi-telescope demonstrator, which both structure and mirrors have been manufactured with silicon carbide. Thanks to theExpand
Development of silicon carbide mirrors: the example of the Sofia secondary mirror
  • M. Fruit, P. Antoine
  • Materials Science, Engineering
  • International Conference on Space Optics
  • 21 November 2017
The 352 mm tip-tilt SOFIA Secondary Mirror has been developed by the ASTRIUM / BOOSTEC joint venture SiCSPACE, taking full benefit of the intrinsic properties of the BOOSTEC S-SiC sintered material,Expand
Some Optical Test Methods Used In Performance Evaluation Of HIPPARCOS Telescope
As the final goal of HIPPARCOS mission is to measure star positions with an extreme accuracy (2 milli-arc sec), severe requirements have been put on the performances of the optical telescope. One ofExpand