光学学报, 2020, 40 (8): 0822002, 网络出版: 2020-04-13   

改进Offner型凸面光栅光谱辐射定标光学系统设计 下载: 986次

Design of Advanced Offner-Type Convex Grating Spectral Radiation Calibration Optical System
徐达 1,*张国玉 1,2孙高飞 1,2
作者单位
1 长春理工大学光电工程学院, 吉林 长春 130022
2 吉林省光电测控仪器工程技术研究中心, 吉林 长春 130022
摘要
针对数字可调光源输出能量较低的问题,提出一种改进型Offner凸面光栅光谱辐射定标光源光学系统的设计方法。基于光线追迹原理,理论推导Offner型光谱成像结构狭缝和像散的关系,利用双柱面透镜对Offner型光谱成像系统大狭缝下的残余像散进行补偿。使用所提方法设计了光谱范围为500~800 nm,狭缝长度为0.4 mm的传统Offner光谱成像系统和狭缝长度为8 mm改进型Offner光谱成像系统。结果表明:改进型Offner光谱成像系统具有良好的成像质量,全视场点列图方均根(RMS)半径小于8.1 μm;系统沿Y方向RMS半径小于6.7 μm,在一个像元尺寸内;谱线弯曲为单像元尺寸6.2%、色畸变为单像元尺寸5.8%,消除了谱线重叠和谱线偏移现象。设计方法对提高遥感仪器的光谱辐射定标精度具有一定的研究意义和工程价值。
Abstract
In this study, we propose a design method of advanced Offner-type convex grating spectral radiation calibration light source optical system to solve the problem of low energy output in case of digital tunable light sources. Further, we theoretically deduce the relation between slit and astigmatism of the Offner-type spectral imaging structure based on the theory of ray tracing. The residual astigmatism in the large slit of the Offner-type spectral imaging system is compensated using a double cylindrical lens. Using the proposed method, a traditional Offner-type spectral imaging system with a slit length of 0.4 mm and an advanced Offner-type spectral imaging system with a slit length of 8 mm are designed having the same spectral range from 500 to 800 nm. The results indicate that the advanced Offner-type spectral imaging system exhibits good image quality and that the root mean square (RMS) radius of full field of view spot diagram is less than 8.1 μm; the RMS radius along the Y direction is less than 6.7 μm, which is within the size of a single pixel. The smile is 6.2% of the size of a single pixel, whereas color distortion is 5.8% of the size of a single pixel; thus, spectral overlapping and spectral offset are diminished. Therefore, the proposed method has some research significance and engineering value to ensure the improved precision of spectral radiometric calibration in case of remote sensing instruments.

徐达, 张国玉, 孙高飞. 改进Offner型凸面光栅光谱辐射定标光学系统设计[J]. 光学学报, 2020, 40(8): 0822002. Da Xu, Guoyu Zhang, Gaofei Sun. Design of Advanced Offner-Type Convex Grating Spectral Radiation Calibration Optical System[J]. Acta Optica Sinica, 2020, 40(8): 0822002.

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