Abstract
It is the main task for the Chinese large solar telescope (CLST) with a 1.8 m aperture to measure the solar polarization with a high accuracy and sensitivity.However, the telescope system itself will introduce instrumental polarization.It also will change constantly with the rotating of the telescope and will reduce the accuracy.Therefore, a calibration unit is necessary to calibrate it.In this paper, we introduced the polarization calibration method and proposed a calibration unit structure.
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