HARP2 Pre-Launch Calibration Overview: The Effects of a Wide Field of View

dc.contributor.authorSienkiewicz, Noah
dc.contributor.authorMartins, J. Vanderlei
dc.contributor.authorMcBride, Brent
dc.contributor.authorXu, Xiaoguang
dc.contributor.authorPuthukkudy, Anin
dc.contributor.authorSmith, Rachel
dc.contributor.authorFernandez-Borda, Roberto
dc.date.accessioned2024-08-07T14:07:53Z
dc.date.available2024-08-07T14:07:53Z
dc.date.issued2024-07-18
dc.description.abstractThe HyperAngular Rainbow Polarimeter (HARP2) is a wide field-of-view (FOV) polarimeter built for the NASA Plankton Aerosol Cloud and Ocean Ecosystem mission launched in early 2024. HARP2 measures the linear Stokes parameters across a 114° × 100° (along-track by cross-track) FOV. In the Fall of 2022, HARP2 underwent calibration at NASA Goddard Space Flight Center (GSFC) Calibration Laboratory (Code 618). HARP2 was characterized for radiometric and polarimetric response across its FOV. We have used telecentric calibration methodology on prior iterations of HARP that involved the normalization of pixels across the FOV such that calibration parameters determined at the center of the charged coupled device (CCD) detector can be used across the entire scene. By using a dual-axis yaw/pitch motorized mount, we devised two scan patterns to evaluate this methodology for HARP2. The results show that pure intensity measurements do indeed vary minimally across the FOV and therefore can utilize the flat-field normalization (telecentric) technique. On the other hand, images of polarized targets change significantly across the FOV, and calibration parameters determined at the center of the detector used in the wide FOV perform significantly worse than calibration parameters determined at or near to the location of the test (up to 5 % mean absolute error in degree of linear polarization, DoLP). We evaluated the use of a paraboloid fit of the polarized calibration parameters, at discrete FOV locations, to determine those parameters at a pixel-level resolution. According to the wide FOV results, this process shows a marked improvement for fully polarized (DoLP = 1) calibration data to less than 1 % uncertainty after using the paraboloid fit. These results are important for the development of any wide FOV polarimeter, especially those like HARP2 which use a front lens which causes significant barrel distortion and a division of amplitude central optical element leveraging multiple reflections. Full characterization of the source of these optical effects remains a part of future work.
dc.description.sponsorshipThe authors acknowledge the funding supports from the NASA FINESST (80NSSC21K1600) on behalf of Noah Sienkiewicz NASA PACE mission, the NASA ESTO InVest project, and the UMBC START award. Additionally, we acknowledge and thank the engineering and support staff at the Earth and Space Institute which have and continue to support all HARP iterations. Further thanks is given to Lorraine Remer for her contributions and insights on this project.
dc.description.urihttps://egusphere.copernicus.org/preprints/2024/egusphere-2024-2024/
dc.format.extent27 pages
dc.genrejournal articles
dc.genrepreprints
dc.identifierdoi:10.13016/m2gqbf-9ury
dc.identifier.urihttps://doi.org/10.5194/egusphere-2024-2024
dc.identifier.urihttp://hdl.handle.net/11603/35249
dc.language.isoen_US
dc.publisherEGU
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department
dc.relation.ispartofUMBC GESTAR II
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology (JCET)
dc.relation.ispartofUMBC Student Collection
dc.rightsCC BY 4.0 DEED Attribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectUMBC Earth and Space Institute
dc.titleHARP2 Pre-Launch Calibration Overview: The Effects of a Wide Field of View
dc.typeText
dcterms.creatorhttps://orcid.org/0000-0002-2930-2032
dcterms.creatorhttps://orcid.org/0000-0002-3138-9341
dcterms.creatorhttps://orcid.org/0000-0001-9583-980X
dcterms.creatorhttps://orcid.org/0000-0002-7371-2338

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