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From the optical characteristics of Herschel-hifi to in-orbit spatial response calibration using Mars

Jellema, W. & Doyle, D., 14-Nov-2017, International Conference on Space Optics, ICSO 2014. Sodnik, Z., Cugny, B. & Karafolas, N. (eds.). Tenerife: SPIE, Vol. 10563. p. 1-9 10 p. 105633E. (Proceedings of SPIE - The International Society for Optical Engineering; vol. 10563).

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  • FROM THE OPTICAL CHARACTERISTICS OF HERSCHEL-HIFI TO IN-ORBIT SPATIAL RESPONSE CALIBRATION USING MARS

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DOI

Making use of all Mars observations taken by Herschel-HIFI, we present a detailed comparison of the measured and predicted beam profiles observed in space. Starting with a number of instrument beam profile models, including one based on actual wavefront measurements in the 480-1625 GHz frequency range, we developed a forward model predicting the detailed characteristics of the beam profile at the sky. Once convolved with the actual brightness temperature distribution and appearance of Mars, this forward model can be compared in detail with the observed spatial response towards Mars, using the science data of HIFI. Since the HIFI instrument is a single-mode coherent receiver, and given the availability of phase-sensitive measurements at instrument level, the results suggest that it is possible to extract some interesting optical characteristics of the Herschel telescope in addition. We discuss a possible way to extract the location of the telescope focus from these observations, which could provide useful feedback to the thermo-elastic properties of the SiC telescope assembly under zero-g and cryogenic conditions.

Original languageEnglish
Title of host publicationInternational Conference on Space Optics, ICSO 2014
EditorsZoran Sodnik, Bruno Cugny, Nikos Karafolas
Place of PublicationTenerife
PublisherSPIE
Pages1-9
Number of pages10
Volume10563
ISBN (Electronic)9781510616158
Publication statusPublished - 14-Nov-2017
EventInternational Conference on Space Optics, ICSO 2014 - La Caleta, Tenerife, Canary Islands, Spain
Duration: 7-Oct-201410-Oct-2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10563
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceInternational Conference on Space Optics, ICSO 2014
CountrySpain
CityLa Caleta, Tenerife, Canary Islands
Period07/10/201410/10/2014

Event

International Conference on Space Optics, ICSO 2014

07/10/201410/10/2014

La Caleta, Tenerife, Canary Islands, Spain

Event: Conference

ID: 112585205