太阳红外成像光谱仪关键技术研究

项目名称： 太阳红外成像光谱仪关键技术研究

项目编号： No.U1231117

项目类型： 联合基金项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 许方宇

作者单位： 中国科学院云南天文台

项目金额： 54万元

中文摘要： 成像光谱仪兼具空间分辨能力和光谱分辨能力；还能通过“差谱”法减除背景影响，获得所关注区域“纯净的谱”，使用相移技术，或能得到物质组成、速度等信息；未来可用于空间探测。但空间调制型成像光谱技术延伸到红外波段还有诸多困难，包括光程差、探测器像元数等问题。 本项目拟针对这些问题发明两种装置：剪切分束装置、移像装置。 项目发明的剪切分束装置可以得到比Sagnac棱镜高2~3个数量级的剪切量，基本满足红外成像光谱仪的光程差需求。 当前红外探测器的像元数目不足以记录全频干涉图像，本项目发明的移像装置可用小面阵探测器获得“大”红外图像。 在此研究基础上，研制太阳红外成像光谱仪原理样机。光谱仪拟采用空间调制型结构，由剪切分束装置实现干涉；探测器上一维得到光谱信息，另一维记录空间信息。采用发明的红外剪切装置，可实现2波数的分辨率。比Sagnac结构提高约2个数量级，远超国内无动镜红外成像光谱仪的最高指标。

中文关键词： 光谱仪；红外光谱仪；空间调制型光谱仪；剪切相干；红外探测器

英文摘要： We are going to invent two devices in our project: shearing splitter, and image shifter; We hope to utility these two devices to the principle prototype of infrared spectral imager proposed by us. In the recent 30 years,the technique of spatial modulation spectral imager close to perfect; The corresponding product has been existed. But, it is hard extending this technique to the infrared band, since the problem of optical path difference primarily (OPD). The shear distance of our shearing splitter can be 100 to 1000 times more than recent one, and the OPD we achieve can meet the requirement of the infrared spectral imager. The pix number of recent infrared detector cannot meet the requirement of recording the whole interferogram. We can record the ‘big’ infrared image with a small detector by using of the image shifter we propose. Based on the research above, we will develop a principal prototype of spectral imager for the solar observation. The operating bandwidth is about 8 micron to 14 micron, which is corresponding to the atmospheric window. The spectrometer is planned to used a spatial modulated structure, the inference is achieved by the shearing splitter; the spectral and spatial information are record by the two dimension on the detector respectively. An OPD of 5 millimeter is obtained by the s

英文关键词： spectrometer；Infrared spectrometer；Spatial modulation spectrometer；Shear coherent；Infrared detector