Sub-percent Characterization and Polarimetric Performance Analysis of Commercial Micro-polarizer Array Detectors
arxiv(2024)
摘要
Polarization imaging can yield crucial information in multiple applications
of remote sensing, such as characterization of clouds, aerosols, and the Aurora
Borealis. Some applications require sub-percent polarimetric sensitivity and
accuracy in determining the Stokes parameters, which can be a challenge to
attain. In 2018, Sony released a low-cost CMOS-based imaging chip with
integrated micro-polarizer array for general polarization measurements. We
implement the calibration steps required for these Sony chips to reach
sub-percent polarimetric accuracies. To analyze their performances, we have
compared the characteristics of four different detector packages by three
manufacturers housing either the monochromatic version or the RGB color
variant. We present a comprehensive overview of the effects that these
characteristics have on the polarimetric performance of the camera. They
include dark noise, behavior over different gain settings, detector/pixel
artifacts, and polarimetric effects determined by polarizer extinction ratios,
polarizer orientations, and accuracy of polarimetric zero points due to
differential pixel gains. In addition to calibrations using unpolarized light
and fully linearly polarized light, we assess the polarimetric sensitivity
within a tilting and rotating glass-plate set-up. We discuss the benefits of
adding a rotating half-wave plate as an additional temporal modulator to
generically mitigate some of the detector effects, and achieve better
polarimetric sensitivity/accuracy albeit at the expense of lower temporal
resolution. We conclude by presenting and discussing the polarimetric limits to
which we were able to calibrate the detector effects for practical purposes. By
reaching a compound absolute polarimetric uncertainty of less than a percent,
these very compact, low-cost detectors are enabled for a multitude of
scientific goals.
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