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A full sky imaging spectropolarimeter that measures spectrally resolved (~2.5 nm resolution) radiance and polarization (s0, s1, s2 Stokes Elements) over approximately 2π sr between 400nm and 1000nm will be used to quantitatively characterize the spectral dependence of the polarization state of the sunlight scattered in the sky. The sensor is based on a scanning push broom hyperspectral imager configured with a continuously rotating polarizer (sequential measurement in time polarimeter). This study will help optimize sky polarimetry by offering information that can be used to select the best spectral band (or which spectra to reject) for a given application. Findings to be presented are sky maps of the angle of polarization and degree of polarization for different spectral bands, spectral dependency of degree (and angle) of polarization, and example data sets supporting each.
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Adam M. Smith, Joseph L. Pezzaniti, David B. Chenault, Art Lompado, "Study of natural down-welling sky light with imaging spectro-polarimeter," Proc. SPIE 10655, Polarization: Measurement, Analysis, and Remote Sensing XIII, 106550M (14 May 2018); https://doi.org/10.1117/12.2310007