图像不稳定性与偏振交叉干扰
Image instabilities and polarization cross-talk
AI总结：
研究探讨了大气视宁度对偏振交叉干扰的影响，并提出方法用于评估极化误差来源及改进极化仪器误差预算。
摘要：
我们扩展了之前关于大气视宁度对偏振交叉干扰影响的研究，并展示了在该工作中开发的正式方法如何应用于处理偏振的空间调制器。除了正式证明在这样的设备中交叉干扰问题完全消除外，我们还获得了关于时间调制方案中偏振噪声意义的见解，在非常高的调制频率极限下。我们还描述了光谱仪不稳定性的问题，以及与线光谱自然相关的光谱梯度如何影响由机械振动、热漂移和指向抖动引起的偏振误差问题。最后，我们展示了如何利用该正式方法来估计偏振交叉干扰对4×4斯托克斯响应矩阵元素误差的贡献，以生成极化仪器的现实误差预算。
英文摘要：
We expand on our previous study of the impact of atmospheric seeing on polarization cross-talk, and show how the formalism that was developed in that work can be applied to treat the case of spatial modulators of polarization. Beside formally demonstrating how the problem of cross-talk is fully eliminated in such devices, we also gain insight on the meaning of polarimetric noise of temporal modulation schemes in the limit of very high modulation frequency. We also describe the problem of spectrograph instabilities, and how the spectral gradients that are naturally associated with a line spectrum feed into the problem of polarimetric errors induced by mechanical vibrations, thermal drifts, and pointing jitter. Finally, we show how this formalism can be used to estimate the contribution of polarization cross-talk to the errors on the elements of the 4$\times$4 Stokes response matrix, for the purpose of producing realistic error budgets for polarimetric instrumentation.
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