Analysis of Seeing-Induced Polarization Cross-Talk and Modulation Scheme Performance

Precision in ground based solar polarimetry: Simulating the role of adaptive optics

Accurate measurement of polarization in spectral lines is important for the reliable inference of magnetic fields on the Sun. For ground based observations, polarimetric precision is severely limited by the presence of Earth's atmosphere. Atmospheric turbulence (seeing) produces signal fluctuations which combined with the non-simultaneous nature of the measurement process cause intermixing of the Stokes parameters known as seeing induced polarization cross-talk. Previous analysis of this effect (Judge et al., 2004) suggests that cross-talk is reduced not only with increase in modulation freque…

图像不稳定性与偏振交叉干扰

Image instabilities and polarization cross-talk

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。

Spatial polarization modulators: distinguishing diffraction effects from spatial polarization modulation

Are we alone? In our quest to find life beyond Earth, we use our own planet to develop and verify new methods and techniques to remotely detect life. Our Life Signature Detection polarimeter (LSDpol), a snapshot full-Stokes spectropolarimeter to be deployed in the field and in space, looks for signals of life on Earth by sensing the linear and circular polarization states of reflected light. Examples of these biosignatures are linear polarization resulting from O2-A band and vegetation, e.g. the Red edge and the Green bump, as well as circular polarization resulting from the homochirality of b…

采用沃尔什调制的uGMRT偏振观测

uGMRT Polarization Observations with Walsh Modulation

本研究验证了沃尔什相位切换方案可缓解uGMRT仪器串扰，提升偏振观测性能，为uGMRT 4波段偏振观测提供了可靠的技术方案。