极紫外成像仪实验室仿真实验

Analysis of Library Simulation Experiments of EUVI

地球等离子体层中He+对太阳辐射中的30.4 nm波长的极紫外(EUV,extreme ultraviolet)辐射形成共振散射。由于等离子层中的He+的30.4 nm辐射近似满足光学薄假设,因而其强度反映了He+的柱密度。因此,对地球等离子体30.4 nm极紫外辐射成像可以直接对地球等离子层进行探测,是研究地球空间磁层空间暴的触发机制和物理模型的重要手段,是进行精确磁暴预测、地球空间环境研究、空间天气预报、自然灾害预测等研究的重要途径。极紫外成像仪(EUVI)通过对30.4 nm的He+共振散射分布进行成像,实现对于地球等离子体层的冷等离子体分布进行研究的目的。首先对极紫外成像仪的工作原理以及成像机理进行了简要描述,对其成像过程进行了介绍。之后根据已研制完成的极紫外成像仪原理样机实验室仿真实验情况,对波形发生器仿真实验与实验室光源-探测器成像仿真实验两种实验方式的原理及实验结果进行了分析研究。根据实验结果,进一步验证了极紫外成像仪信号处理系统原理设计的可行性与正确性。同时,根据实验结果中出现的问题,也为对成像仪系统的进一步优化提供方向。

The resonantly-scattered emission of He^＋, in plasma of the earth, forms the extreme ultraviolet. Because the resonantly-scattered emission of He ＋ at 30.4 nm satisfies the assumption of optically thin, its intensity images the integrated column density of He^＋. The method of imaging the resonantly-scattered emission of He^＋ at 30.4 nm is the main technique to research the occurring mechanism and physical models of the earth＇ s magnetic storm. And it is the main approach to accurately forecast the geomagnetic storm, to do research on the earth space environment, to forecast the space weather and to forecast the natural disaster. The Extreme Ultraviolet Imager （EUVI） is designed to study the distribution of cold plasma in Earth＇ s plasmasphere by imaging the distribution of the He^＋ ion through its emission at 30.4 nm. It is firstly described the working principle of the EUV imager, analyzed the process of imaging and introduced the constitutes of the imager system. And then according to the library simulation examination of EUVI, it analyzed the ＂Waveform generator simulation experiment＂ and the ＂Light sourcedetector imaging simulation experiment＂. At last the feasibility and correctness of designing principle of the EUV imager are validated by lab simulation experiment.