Research On Polarization Calibration And Data Acquisition Mode Of NVST High-resolution Magnetograph

The solar magnetic field is of great significance in the study of solar physics.The highresolution images of solar magnetic field is essential for studying the small scale solar activity.NVST can provide high-resolution images,and is now developing high-resolution Magnetograph.Before we use the magnetograph to measure solar magnetic field,polarization calibration should be done for the telescope and the magnetograph.In this paper,we designed experiments to measure the parameters of the KD*P-type polarization analyzer and the beam splitter in the magnetograph.We compared the polarization effect of different beam splitter,and this provides an important reference for the choose of the beam splitter.High-resolution magnetograph of NVST uses synchronous reconstruction technology to achieve high spatial resolution,thus data acquisition mode of magnetograph is very important,and it will directly affect the reconstruction result of image.In this paper,we discussed the data acquisition mode of high-resolution magnetograph,and the influence of KD*P-type polarization analyzer and CMOS camera on synchronous reconstruction.The innovation of this paper is as follows:· Designed experiments on parameter measurement of KD*P-type polarimeter;· Improved the accuracy of the splitter Mueller matrix measurement by using the air Mueller matrix for calibration.· Several data acquisition modes are discussed for NVST high-resolution magnetograph,and a synchronous test experiment for KD*P and COMS camera is designed;...