Design of an Offner convex grating radiation calibration light source with a wide dynamic range
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摘要: 为满足在各种谱线分布下对遥感仪器的光谱辐射定标，减小辐射定标光源对空间光学遥感仪器定标系数的影响，解决目前辐射定标光源光谱模拟精度低、光谱动态调节范围小的技术难题，本文从光谱叠加理论出发，根据多光谱合成原理，提出一种凸面光栅的Offner型宽动态范围辐射定标系统的设计方法。通过推导Offner型光谱成像光学结构的消像散条件，设计了一种柱面镜Offner型光谱成像光学系统，实现了宽光谱光束的精确细分，建立了数字微镜与其阵列面空间光谱辐射分布的映射关系。利用数字微镜的空间光调制特性，实现了辐射定标光源光谱分布大动态范围模拟。实验表明，辐射定标光源相邻单位阵列微镜的输出光谱峰值间隔小于0.5 nm，3种典型色温T=3000 K、T=5000 K和T=7000 K光谱模拟精度分别为5.2%、4.1%和3.2%。本文提出的设计方法有效提高了辐射定标光源的光谱模拟精度，减小了光谱不匹配对空间光学遥感仪器定标系数的影响。
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关键词:
- 光谱辐射定标 /
- 光谱模拟 /
- Offner光谱成像系统 /
- 凸面光栅 /
- 光谱精确细分
Abstract: In order to satisfy the spectral radiance calibration of remote sensing instruments in different spectral distribution, reduce the influence of spectral radiance calibration light sources on the calibration coefficients of space optical remote sensing instruments, and solve technical problems of low spectral simulation accuracy and small spectral dynamic adjustment range, a design method for Offner type convex grating radiation calibration systems with a wide dynamic range based on spectral superposition and the principles of multi-spectral synthesis was presented, and its anastigmatic conditions were derived. The Offner spectral imaging optical system was designed with a cylindrical mirror with an accurate subdivision of broad spectral beams. Then, the mapping relationship between the array surface of the Digital Micro-mirror Device (DMD) and its spatial spectral radiation distribution was designed. The large dynamic range simulation of spectral distribution with the spatial light modulation characteristics of the DMD was achieved. Experiment results show that the interval of the spectral peak has an output by the adjacent unit array micro-mirror is greater than 0.5 nm, the spectral simulation accuracy of three typical color temperatures is 5.2% at T=3000 K, 4.1% at T=5000 K, and 3.2% at T=7000 K. The spectral simulation accuracy of the radiation calibration source was significantly improved, and the influence of spectral mismatch on the calibration coefficients of space optical remote sensing instruments was effectively diminished. -
图 1 宽动态范围辐射定标光源结构示意图
Figure 1. Schematic diagram of radiation calibration light source with a wide dynamic range
图 3 Offner型光谱成像系统光学结构
Figure 3. Optical structure of Offner type spectral imaging system
图 4 不同波长下Offner型光谱成像系统点列图
Figure 4. Spot diagram of Offner type spectral imaging system at different wavelengths
图 7 不同峰值波长处数字微镜阵列面空间光辐射分布数据库
Figure 7. Light radiation distribution database on DMD array surface at different peak wavelengths
图 9 T=3000 K时模拟光谱的实测结果
Figure 9. Measurement results of simulated spectrum when T = 3000 K
图 10 T=5000 K时模拟光谱的实测结果
Figure 10. Measurement results of simulated spectrum when T = 5 000 K
图 11 T=7000 K时模拟光谱的实测结果
Figure 11. Measurement results of simulated spectrum when T = 7000 K
表 1 Offner型光谱成像系统光学结构参数
Table 1. Optical structure parameters of Offner type spectral imaging system
Surface Radius/mm Thickness Glass Lines/lp·mm−1 1 −84.500 30 Mirror 2 −473.676 30 Grating 600 3 −95.065 55.545 Mirror 
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