不同光栅常数下同心长波红外成像光谱仪对比

发布时间：2018-01-31 23:17

本文关键词： 光谱学长波红外成像光谱仪光栅常数同心结构　出处：《红外与激光工程》2016年07期 　论文类型：期刊论文

【摘要】：为对比分析不同光栅常数下Offner光栅和Dyson光栅光谱仪的性能差异,推导了两种光谱仪结构的衍射角公式,获得其衍射特点,并在F数为2.5,工作波段为8~12μm,光谱分辨率15.6 nm,光栅常数分别为100μm、50μm下,借助ZEMAX软件对这两种结构进行了优化设计。结果表明:较大光栅常数下,两者都能理想成像,Offner光谱仪体积约为Dyson的7倍,质量约为Dyson的1/13;较小光栅常数下,Dyson光谱仪仍可理想成像,而Offner必须加入二次非球面镜并进行离轴,才能满足系统对像质及光谱分辨率的要求,此时,Offner光谱仪体积约为Dyson的7倍,重量约为Dyson的1/11。设计结果表明,两种同心结构在加工难易度、体积、重量方面各有优劣,在光谱仪选型工作中,可根据具体情况进行取舍。
[Abstract]:In order to compare and analyze the difference between Offner grating and Dyson grating spectrometer under different grating constants, the diffraction angle formula of two kinds of spectrometers was deduced, and the diffraction characteristics were obtained. When the F number is 2.5, the working band is 8o 12 渭 m, the spectral resolution is 15.6 nm, and the grating constant is 100 渭 m ~ 50 渭 m, respectively. The optimal design of these two structures is carried out by using ZEMAX software. The results show that both of them can be ideally imaged in a volume of about 7 times that of Dyson when the grating constants are large. The mass is about 1 / 13 of Dyson; In order to meet the requirements of image quality and spectral resolution, Offner must add a secondary non-spherical mirror and off-axis to meet the requirements of image quality and spectral resolution. The volume of Offner spectrometer is about 7 times of that of Dyson, and the weight is about 1 / 11 of Dyson. The design results show that the two concentric structures have their own advantages and disadvantages in processing difficulty, volume and weight. In the type selection of spectrometer, we can choose and choose according to the specific situation.
【作者单位】：中国科学院长春光学精密机械与物理研究所;中国科学院大学;
【基金】：国家重大科学仪器设备开发专项(2013YQ14051702) 吉林省省科技厅项目(20140204030GX)
【分类号】：TH744.1
【正文快照】： 0引言成像光谱仪是在多光谱遥感成像技术基础上发展起来的新型空间大气光学遥感仪器,其能够以高光谱分辨率获取目标的超多谱段[1]。工作于长波红外波段(8~12μm)的成像光谱仪在物质探测识别方面具有明显的优势,且保密性好、可昼夜连续工作、受天气影响较小、抗干扰能力强。随

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