Universal birefringent filter with a new double passband mode |
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| Authors: | Jingshan Wang Guoxiang Ai Guofeng Song Bin Zhang Xiangming Ye Yingping Nie Tzihong Chiveh Weanshun Tsay and Huanshin Li |
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| Institution: | (1) Beijing Astronomical Observatory, Chinese Academy of Sciences, 100080 Beijing, China;(2) Department of Physics, National Central University, Chung-Li, Taiwan |
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| Abstract: | This article describes the universal birefringent filter (UBF) which will be mounted at Taiwan. The UBF permits observations of solar images, vector magnetic fields and/or line-of-sight velocity fields in any Fraunhofer line in the wavelength region from 4000  to 7000 with half width from 0.05 to 0.14 . We have tested it at ten Fraunhofer lines under a spectral telescope in Huairou Station of Beijing Astronomical Observatory and obtained the passband profiles. The principles of magnetic field and velocity field measurement with the UBF are also described. |
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