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Optimizing imaging polarimeters constructed with imperfect optics

机译：优化使用不完善的光学器件构造的成像旋光仪

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摘要

Imaging polarimeters are often designed and optimized by assuming that the polarization properties of the optics are nearly ideal. For example, we often assume that the linear polarizers have infinite extinction ratios. It is also usually assumed that the retarding elements have retardances that do not vary either spatially or with the angle of incidence. We consider the case where the polarization optics used to develop an imaging polarimeter are imperfect. Specifically, we examine the expected performance of a system as the extinction ratio of the diattenuators degrades, as the retardance varies spatially, and as the retardance varies with incidence angle. It is found that the penalty in the signal-to-noise ratio for using diattenuators with low extinction ratios is not severe, as an extinction ratio of 5 causes only a 2.0 dB increase in the noise in the reconstructed Stokes parameter images compared with an ideal diattenuator. Likewise, we find that a system can be optimized in the presence of spatially varying retardance, but that angular positioning error is far more important in rotating retarder imaging polarimeters.
机译：通常通过假设光学器件的偏振特性接近理想，来设计和优化成像偏振仪。例如，我们经常假设线性偏振片具有无限大的消光比。通常还假设，延迟元件具有在空间上或随入射角不变的延迟。我们考虑了用于开发成像偏振计的偏振光学器件不完善的情况。具体而言，我们检查了系统的预期性能，即衰减器的消光比降低，延迟在空间上的变化以及延迟随入射角的变化而变化的情况。发现使用低消光比的衰减器对信噪比的影响并不严重，因为消光比为5时，与理想信号相比，重建的斯托克斯参数图像中噪声只会增加2.0 dB。衰减器。同样，我们发现可以在存在空间变化的延迟的情况下优化系统，但是在旋转延迟器成像旋光仪中，角度定位误差更为重要。

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