Polarimetric calibration of large-aperture telescopes. I. Beam-expansion method.
Polarimetric calibration of large-aperture telescopes. I. Beam-expansion method.
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DOI：
10.1364/josaa.22.000539
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发表时间：
2004-10
期刊：
影响因子：
--
通讯作者：
H. Socas-Navarro
中科院分区：
文献类型：
--
作者：
H. Socas-Navarro
本文提出了一种高精度绝对定标大口径望远镜主镜引入的仪器偏振的方法。该过程需要具有偏振校准光学器件的小孔径（例如，安装在圆顶上），其后是打开光束以照亮镜子的整个表面的透镜。对应于该校准设置（具有发散入射光束）的琼斯矩阵通过近似校正项与正常观察设置（具有准直入射光束）的琼斯矩阵相关。数值模型的抛物面在轴和离轴反射镜的表面缺陷，以探讨该程序的准确性。
A concept is described for the high-accuracy absolute calibration of the instrumental polarization introduced by the primary mirror of a large-aperture telescope. This procedure requires a small aperture with polarization-calibration optics (e.g., mounted on the dome) followed by a lens that opens the beam to illuminate the entire surface of the mirror. The Jones matrix corresponding to this calibration setup (with a diverging incident beam) is related to that of the normal observing setup (with a collimated incident beam) by an approximate correction term. Numerical models of parabolic on-axis and off-axis mirrors with surface imperfections are used to explore the accuracy of the procedure.