Abstract
Abstract. The Spaceborne Directional Polarimetric Camera (SDPC) is dedicated to obtain an accurate information of clouds and microphysical properties of aerosol particles via multi-angle, multi-spectral and multi-polarization observations. It images the Earth with 110° field of view (FOV) in 3 polarimetric spectral bands and 5 non-polarimetric spectral bands from visible to near infrared. Due to its wide FOV telecentric optical system and multi-channels, polarization sensitivity of optical components (PSOC) and non-uniform response of pixels (NURP) are the main uncertainty factors of polarimetric calibration.In this paper, a polarimetric calibration model of SDPC has been constructed for increasing the measurement accuracy. Combined an integrating sphere with a polarization generator as source, PSOC can be measured in high accuracy by using the Fourier series analysis method which reduces the impact form the alignment error of the generator. The sectional viewing field measurement method is used to acquire NURP while the large aperture integrating sphere served as reference source. Subsequently, the data of NURP have been corrected by the relative transmittance of high frequency and low frequency respectively for polarized channels. The result of validation experiment shows that the polarization measurement errors in 0°, 15°, 30°, and 45° half field of view (HFOV) are all less than 0.5% when the degree of linear polarization of reference source is larger than 0.1.
Highlights
SDPC (Spaceborne Directional Polarimetric Camera) (Huang et al, 2014; Luo et al, 2018; Qian, 2017; Qian et al, 2017; Yang et al, 2015) is a polarimeter designed for accurately acquiring clouds and aerosol particle microphysical properties via multi-angle, multi-spectral and multi-polarization observations
A new polarimetric calibration model of SDPC has been proposed for analyzing polarization sensitivity of optical components (PSOC) and non-uniform response of pixels (NURP)
A fitting of 7th power polynomial is obtained to simulate the distribution of the PSOC of full field of view (FOV)
Summary
SDPC (Spaceborne Directional Polarimetric Camera) (Huang et al, 2014; Luo et al, 2018; Qian, 2017; Qian et al, 2017; Yang et al, 2015) is a polarimeter designed for accurately acquiring clouds and aerosol particle microphysical properties via multi-angle, multi-spectral and multi-polarization observations. SDPC is developed by Anhui Institute of Optics and Fine Mechanics which installed on the GF-5 satellite and launched in May 2018 (Kang, 2018; Kang et al, 2019; Yuan et al, 2019) Both along-track and cross-track instantaneous viewing field of SDPC are 110°. It has an ultra-wide field of view (FOV) telecentric lenses, a rotating wheel bearing filter and a two-dimensional CCD 512 × 512 pixels detector array. The sectional viewing field measurement method is applied to acquire the relative transmittance of high frequency and low frequency for calibration of NURP. A polarimetric calibration accuracy experiment is designed for validation and verification of this model
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