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PSF modeling of the XMM flight mirror modules
Stockman, Yvan; Houbrechts, Yvette; Nazé, Yaël et al.
1999In Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series
 

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Abstract :
[en] In the frame of XMM testing, all the mirror modules have been illuminated by a vertical EUV collimated beam a the Centre Spatial de Liege. A mirror module consists in 58 co- focal and co-axial Wolter I mirrors. Up to now the images obtained at CSL have been used to assess the Mirror Module optical performances in a flight representative configuration, and also to verify the impact of the thermal environmental and vibration test on the optical performance. Due to the highly complex design of the Mirror Modules, simulating XMM images in details is very difficult. The Point Spread Function of some of the mirror modules presents slight asymmetry. In the facility design study, it has been demonstrated that the diffraction impact at 58.4 nm is negligible with respect to the half energy width mirror module specification. Presently all the mirror modules are better than 165 arcsec. This paper presents first the diffraction contribution on the image. In a second step a point spread function is built by using the metrological mirror shell data. EUV images are then analyzed to evaluate the impact of the mirror interface structure integration process on the PSF. An analytical model of the measured EUV pSF is developed. The modelization technique is applied to simulate in-orbit image. Finally the different modelizations are evaluated and compared.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Stockman, Yvan ;  Université de Liège - ULiège > CSL (Centre Spatial de Liège)
Houbrechts, Yvette ;  Université de Liège - ULiège > CSL (Centre Spatial de Liège)
Nazé, Yaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales
Rochus, Pierre  ;  Université de Liège - ULiège > CSL (Centre Spatial de Liège) - Instrumentation et expérimentation spatiales
Tock, Jean P
Gondoin, Philippe
Language :
English
Title :
PSF modeling of the XMM flight mirror modules
Publication date :
01 October 1999
Audience :
International
Main work title :
Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series
Pages :
265-275
Available on ORBi :
since 02 July 2009

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