Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/7794
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dc.contributor.authorKathiravan, S
dc.contributor.authorTandon, S. N
dc.contributor.authorPrasad, B. R
dc.contributor.authorSriram, S
dc.contributor.authorPradeep, A
dc.contributor.authorVishnu, T
dc.contributor.authorMahesh, P. K
dc.contributor.authorKamath, P. U
dc.contributor.authorNagabhushana, S
dc.contributor.authorAmit Kumar
dc.date.accessioned2021-07-18T06:01:38Z
dc.date.available2021-07-18T06:01:38Z
dc.date.issued2021-10
dc.identifier.citationJournal of Astrophysics and Astronomy, Vol. 42, No. 2, 41en_US
dc.identifier.issn0973-7758
dc.identifier.urihttp://hdl.handle.net/2248/7794
dc.descriptionRestricted Accessen_US
dc.descriptionThe original publication is available at springerlink.com
dc.description.abstractUltra Violet Imaging Telescope (UVIT) is one of the 5 instruments on AstroSat satellite, which was launched on September 28, 2015. UVIT was designed to make images with a resolution of <1.8′′, simultaneously in two ultraviolet channels: Far Ultraviolet (130–180 nm) and Near Ultraviolet (200–300 nm). Images are also made in visible region (320–550 nm) for tracking drifts in pointing. The shortest wavelengths to be observed with UVIT can be heavily absorbed by mono-molecular deposits/contamination on the optical surfaces. Keeping contamination under control in UVIT was a major challenge and it required a variety of actions: (i) strict control of the payload materials and process, (ii) mechanical configuration, (iii) baking of all the parts to release all the adsorbed molecules etc., (iv) assembly in ultra cleanrooms, (v) pre-inspection and auditing of all the areas, in which UVIT was placed, for any potential for contamination, (vi) continuous purging, with ultra-pure nitrogen gas, till a few days before the launch, etc. In order to minimise any possible cross contaminations from the other payloads/satellite, the doors of UVIT were opened 2 months after the launch. The high performance in the orbit and high stability of the sensitivity over 4 years in the orbit shows that the contamination was negligible. This paper presents the processes and protocols followed during the integration and testing phase to minimise the contamination in order to prevent any performance degradation.en_US
dc.language.isoenen_US
dc.publisherIndian Academy of Sciencesen_US
dc.relation.urihttps://doi.org/10.1007/s12036-020-09681-4
dc.rights© Indian Academy of Sciences
dc.subjectMolecular contaminationen_US
dc.subjectUltraviolet opticsen_US
dc.subjectSpace opticsen_US
dc.subjectTransmission measurementsen_US
dc.subjectUltra high pure (UHP) nitrogen purgingen_US
dc.titleContamination control of UVITen_US
dc.typeArticleen_US
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