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Optical performance of the JWST/MIRI flight model: characterization of the point spread function at high resolution

hal.structure.identifierInstitut d'astrophysique spatiale [IAS]
dc.contributor.authorGUILLARD, Pierre
hal.structure.identifierLaboratoire des signaux et systèmes [L2S]
dc.contributor.authorRODET, Thomas
dc.contributor.authorRONAYETTE, S.
dc.contributor.authorAMIAUX, J.
hal.structure.identifierInstitut d'astrophysique spatiale [IAS]
dc.contributor.authorABERGEL, Alain
hal.structure.identifierEDF [EDF]
dc.contributor.authorMOREAU, V.
dc.contributor.authorAUGUÈRES, J.-L.
dc.contributor.authorBENSALEM, A.
dc.contributor.authorORDUNA, T.
dc.contributor.authorNEHMÉ, C.
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierUniversité Sciences et Technologies - Bordeaux 1 [UB]
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
dc.contributor.authorBELU, A. R.
hal.structure.identifierAstrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]
dc.contributor.authorPANTIN, Eric
hal.structure.identifierAstrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]
dc.contributor.authorLAGAGE, Pierre-Olivier
hal.structure.identifierInstitut d'astrophysique spatiale [IAS]
dc.contributor.authorLONGVAL, Y.
dc.contributor.authorGLASSE, A. C. H.
dc.contributor.authorBOUCHET, P.
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique [LESIA]
dc.contributor.authorCAVARROC, Céline
hal.structure.identifierAstrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]
hal.structure.identifierInstitut de Recherches sur les lois Fondamentales de l'Univers [IRFU]
dc.contributor.authorDUBREUIL, D.
hal.structure.identifierleiden Obsevatory
dc.contributor.authorKENDREW, Sarah
dc.date.issued2010-07-29
dc.date.conference2010-06-27
dc.description.abstractEnThe Mid Infra Red Instrument (MIRI) is one of the four instruments onboard the James Webb Space Telescope (JWST), providing imaging, coronagraphy and spectroscopy over the 5 - 28 μm band. To verify the optical performance of the instrument, extensive tests were performed at CEA on the flight model (FM) of the Mid-InfraRed IMager (MIRIM) at cryogenic temperatures and in the infrared. This paper reports on the point spread function (PSF) measurements at 5.6 μm, the shortest operating wavelength for imaging. At 5.6 μm, the PSF is not Nyquist-sampled, so we use am original technique that combines a microscanning measurement strategy with a deconvolution algorithm to obtain an over-resolved MIRIM PSF. The microscanning consists in a sub-pixel scan of a point source on the focal plane. A data inversion method is used to reconstruct PSF images that are over-resolved by a factor of 7 compared to the native resolution of MIRI. We show that the FWHM of the high-resolution PSFs were 5 - 10 % wider than that obtained with Zemax simulations. The main cause was identified as an out-of-specification tilt of the M4 mirror. After correction, two additional test campaigns were carried out, and we show that the shape of the PSF is conform to expectations. The FWHM of the PSFs are 0.18 - 0.20 arcsec, in agreement with simulations. 56.1 - 59.2% of the total encircled energy (normalized to a 5 arcsec radius) is contained within the first dark Airy ring, over the whole field of view. At longer wavelengths (7.7 - 25.5 μm), this percentage is 57 - 68 %. MIRIM is thus compliant with the optical quality requirements. This characterization of the MIRIM PSF, as well as the deconvolution method presented here, are of particular importance, not only for the verification of the optical quality and the MIRI calibration, but also for scientific applications.
dc.language.isoen
dc.source.titleSpace Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave (Proceedings Volume)
dc.title.enOptical performance of the JWST/MIRI flight model: characterization of the point spread function at high resolution
dc.typeCommunication dans un congrès
dc.identifier.doi10.1117/12.853591
dc.subject.halInformatique [cs]/Traitement du signal et de l'image
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.subject.halSciences de l'ingénieur [physics]/Traitement du signal et de l'image
dc.identifier.arxiv1006.5735
bordeaux.pageID_7731-18
bordeaux.volume7731
bordeaux.conference.titleSPIE : Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave
bordeaux.countryUS
bordeaux.title.proceedingSpace Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave (Proceedings Volume)
bordeaux.conference.citySan Diego, California
bordeaux.peerReviewedoui
hal.identifierhal-00547688
hal.version1
hal.invitednon
hal.proceedingsoui
hal.conference.end2010-07-02
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00547688v1
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