用于大气遥感的远紫外光栅色散成像光谱仪的研究

Study on Far Ultraviolet Imaging Spectrometer with Grating Dispersion for Atmosphere Remote Sensing

远紫外光栅色散型成像光谱仪在空间大气遥感领域主要用于电离层、热层、极光和辉光的探测。文章根据临边与天底结合的大气成像光谱探测原理,提出了探测方案,设计了适用于远紫外波段的光栅色散型成像光谱仪的两种光学系统,并选择了平面光栅结构进行研制集成,在国内首次获得了原理样机。样机工作波段为120～180nm,望远系统采用离轴抛物镜,光谱成像系统采用改进型的Czerny-Turner结构,探测器使用远紫外响应背照型增强CCD。搭建了相应的实验系统对样机的基本性能参数进行了测试,测得光谱分辨率约为2nm,空间分辨率0.5mrad。这种远紫外光栅色散型成像光谱仪的研究对完善我国大气遥感事业具有重要的研究与应用价值。

The far ultraviolet imaging spectrometer with grating dispersion is mainly used in the detection of the ionosphere,thermosphere,auroral zone and glow zone.It is important for the study and application of the remote sensing of atmosphere in China.We designed two optical systems for the far ultraviolet imaging spectrometer,and obtained the plane grating structure prototype based on the principles of nadir and limb atmospheric sounding.The prototype working at the waveband of 120～180 nm consists of an off-axis parabolic mirror and an advanced Czerny-Turner spectral imaging system.The far ultraviolet response back-illuminating CCD is adopted as the detector.The corresponding experiment system was built to calibrate the basic performances of the spectrometer prototype.The spectral and spatial resolutions are 2 nm and 0.5 mrad respectively.The far ultraviolet imaging spectrometer prototype plays an important role in the study and application of atmospheric remote sensing.