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Scatter due to Ultraviolet (UV) photopolymerization of molecular contamination on optical surfaces

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dc.contributor.author Narra, V. S
dc.contributor.author Budihal, R. P
dc.contributor.author Somasundaram, P. K
dc.contributor.author Sriraman, K
dc.contributor.author Venkatasubramanian, N
dc.contributor.author Padavu, U. K
dc.contributor.author Mani, V. T
dc.contributor.author Basavaraja, S
dc.contributor.author Naik, R
dc.date.accessioned 2021-02-07T05:04:26Z
dc.date.available 2021-02-07T05:04:26Z
dc.date.issued 2020-12
dc.identifier.citation Experimental Astronomy, Vol. 50, No. 2-3, pp. 265-287 en_US
dc.identifier.issn 1572-9508
dc.identifier.uri http://hdl.handle.net/2248/7596
dc.description Restricted Access © Springer https://doi.org/10.1007/s10686-020-09675-8 en_US
dc.description The original publication is available at springerlink.com
dc.description.abstract Molecular contamination on optical surfaces is a serious issue for space payloads. For ultraviolet (UV) payloads, molecular contamination results in loss of throughput. Whereas, for visible (VIS) payloads loss of throughput due to molecular contamination is not very critical. However, UV photopolymerization of molecular contamination can create serious problems to VIS payloads with stringent scatter requirements. Visible Emission Line Coronagraph (VELC) on board ADITYA-L1 mission is one of them. For such payloads, quantifying the effect of molecular contamination in terms of scattered light is very critical. To do the same, UV exposure studies are carried out on optical surfaces with different levels of molecular contamination. Contamination levels are defined by the weight and mass loss of the contaminant. UV dosage levels on the optical surfaces is determined by the number of hours of UV exposure and UV irradiance levels. Variation in the scatter from the optical surfaces is measured pre and post UV exposures. Contaminated optical samples are exposed to the UV radiation levels equivalent to 125 days of mission life. Substantial increase in the scatter of the contaminated samples is observed due to the UV exposure. Increase in scatter is more rapid in the initial mission days (up to 45 days). This paper elaborates the experiments carried out and discusses the results from them. en_US
dc.language.iso en en_US
dc.publisher Springer en_US
dc.subject Solar en_US
dc.subject Coronagraph en_US
dc.subject Molecular contamination en_US
dc.subject UV photopolymerization en_US
dc.subject ADITYA-L1 mission en_US
dc.title Scatter due to Ultraviolet (UV) photopolymerization of molecular contamination on optical surfaces en_US
dc.type Article en_US

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