基于PSIM原理的太阳光谱偏振仪关键技术研究

项目名称： 基于PSIM原理的太阳光谱偏振仪关键技术研究

项目编号： No.U1531113

项目类型： 联合基金项目

立项/批准年度： 2016

项目学科： 天文学、地球科学

项目作者： 宋志平

作者单位： 安徽大学

项目金额： 47万元

中文摘要： 时间分辨率不高是现有光谱型太阳偏振仪需要解决的共性问题。由两块高阶延迟器和一块检偏器构成的偏振光谱强度调制（PSIM）模块，可同步调制入射光四个Stokes矢量元素谱并叠加成强度谱输出，而光谱仪中的CCD只需一次曝光即可记录该强度谱，得到解析入射光四个Stokes矢量元素谱所需原始数据。系统中无转动件，不需要分时测量。因此，在光谱仪入射光路中加装PSIM模块，理论上可构建具有更高时间分辨率和偏振测量精度的太阳光谱偏振仪。项目组拟在PSIM原理前期研究基础上，结合太阳偏振观测需求，通过理论分析、数值模拟确定系统关键件匹配设计参数，分析系统主要误差源；研制太阳光谱偏振仪原理样机，开展模拟观测实验；改进基于傅里叶变换、滤波和解调制处理的强度谱数据分析流程，发展一套含自校准功能、可精确解调太阳光谱偏振信息的数据处理算法。项目研究有利于推动先进光谱偏振信息获取技术在我国太阳物理等天文观测领域的应用。

中文关键词： 太阳磁场；偏振测量；光谱技术；偏振光谱强度调制

英文摘要： It is a common problem need to be solved urgently that the time resolution of the existing solar spectr-polarimeters is not enough. All Stokes vectors spectrum from incident light can be modulated and superimposed to power spectrum in its output by Polarization Spectral Intensity Modulation (PSIM) module, made up of two piece of retarders and one polarizer, the raw data(the power spectrum) needed to analyze the stokes vectors spectrum can be recorded on the CCD in the spectrometer, and the CCD of specrometer exposures only one time. There is no any rotating part in the new solar spectro-polarimeter, and measure only one time. So, the time resolution and polarization measurement precision of the new solar spectro-polarimeter can be better theoretically that be made by adding the PSIM module to spectrometer. Based on the earlier research of PSIM, combined with the requirements of solar spectro-polarization observation, this project aims at:.●determine parameters of the key parts , analyze source of the main errors by theoretical analysis and numerical simulation;.●develop principled machine , and carry out simulative measurement experiment; and.●improve the procedure of data procedure based on the FFT, filtering and demodulating for the data of intensity spectrum , and develop a new demodulation algorithm which can self-calibrate ,and can analysis the solar spectro-polarization information accurately. The achievements of the project will promote the advanced specro-polarization information acquisition method applied in the field of astronomy, such as solar physics, in our country.

英文关键词： solar magnetic field;polarization measurement ; spectrum technology;Polarization Spectral Intensity Modulation