Magnetic field plays a crucial role in determining solar structure and triggering solar activities. It is believed that all kinds of the solar activities are associated with solar magnetic field, and the research for the mechanisms hidden becomes one of the frontiers in solar physics. High spatial resolution, high temporal resolution and high precision of the solar magnetic field observations has been always one of the important tasks, and this depends on suitable and precise spectrum polarimetry. In the first chapter of this thesis, the measurement principle and methods of the solar magnetic field are introduced, especially the Zeeman effect which produces the dominant polarization properties of solar spectrum. Analyzing the polarization characteristics produced by it becomes a main tool for diagnostic of the magnetic field. The second chapter is allocated to a variety of polarimeters used or to be used and their polarimetric e ciencies as well as optimization are emphasized. In the third chapter, we present the polarimeter design according to the scientic goals and characteristics of Fibre Arrayed Solar Optical Telescope(FASOT). It shows that the design has high polarimetric effi ciency at the selected lines, and excellent performance in dealing with errors. The application of optical switching technology greatly enhances the ccuracy of polarization measurement.
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