Polarimeter with two ferroelectric liquid-crystal modulators attached to the Yunnan solar tower.
Polarimeter with two ferroelectric liquid-crystal modulators attached to the Yunnan solar tower.
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DOI：
10.1364/ao.45.008428
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发表时间：
2006-11
期刊：
影响因子：
1.9
通讯作者：
Chenglin Xu;Z. Qu;Xiaoyu Zhang;C. Jin;Xiaoli Yan
中科院分区：
文献类型：
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作者：
Chenglin Xu;Z. Qu;Xiaoyu Zhang;C. Jin;Xiaoli Yan
介绍了一种安装在云南太阳塔上的偏振计。它通过分析在两个区域形成的磁敏线的Stokes光谱，具有极高的极化测量效率，能够同时测量太阳光球和色球的磁场。偏振计由两个铁电液晶和一个λ /4波片组成，然后是偏振分束器。强调该设计的消色差，以便在5000到6000 a的光谱范围内获得最大的组合效率。对于MgI517.27、FeI525.06、FeI630.15和FeI630.25 nm的旧太阳能吸收线，设计的偏振测量理论效率分别为0.999、1.0、0.943和0.943。与其他参考偏振计，如太阳天气光学长期调查、特内里费红外偏振计和拉帕尔马斯托克斯偏振计进行了比较。
A polarimeter to be mounted on the Yunnan solar tower is described. It features the ability to simultaneously measure the magnetic fields of the solar photosphere and chromosphere by analyzing the Stokes spectra of those magnetosensitive lines forming in the two regions with very high efficiency of polarization measurement. The polarimeter consists of two ferroelectric liquid crystals and one lambda/4 wave plate before a polarizing beam splitter. The achromatism of the design is emphasized to get the maximum combination efficiency over a spectral range from 5000 to 6000 A. For the used solar absorption lines MgI517.27, FeI525.06, FeI630.15, and FeI630.25 nm, the design gives theoretical efficiencies of polarization measurements, which are 0.999, 1.0, 0.943, and 0.943, respectively. A comparison with other reference polarimeters, such as the Synoptic Optical Long-term Investigation of the Sun, the Tenerife infrared polarimeter, and the La Palma Stokes Polarimeter, is carried out.