Yang Jin, Cui Ji-cheng, Qi Xiang-dong, Tang Yu-guo, Yao Xue-feng
Guang Pu Xue Yu Guang Pu Fen Xi. 2016 May;36(5):1537-42.
In order to meet the requirements of high spectral resolution and high image quality on the hyperspectral imaging system, and to meet the new demands of miniaturization, light weight, and high optical efficiency in practical applications, a prism known as hyperspectral imaging system based on Littrow configuration is designed. The use of off-axis two-mirror Littrow configuration is to reduce the size of the optical system and provide a collimated beam for the plane prisms. To avoid the optical path interference, the macro programming optimization is applied. The application of two correct lens and aspheric mirrors can correct the spectral smile and the keystone of the hyperspectral imaging system. It is indicated that the distortion is less than 2.1 μm and the spectral bend is less than 1.3 μm, both are controlled within 18% pixel. The analytical results indicate that the MTF in the visible-near infrared(VNIR) spectral region from 400 to 1 080 nm is above 0.9 while spectrum resolution is about 1.6～5.0 nm, the spectral transmittance more than 51.5%. The results show that the system has high transmittance and image quality within the whole spectral range.
为满足高光谱分辨率和高图像质量对高光谱成像系统的要求，并满足实际应用中对小型化、轻量化和高光学效率的新需求，设计了一种基于利特罗结构的棱镜型高光谱成像系统。采用离轴双镜利特罗结构以减小光学系统尺寸，并为平面棱镜提供准直光束。为避免光程干扰，应用了宏编程优化。使用两块校正透镜和非球面镜可校正高光谱成像系统的光谱微笑和梯形失真。结果表明，失真小于2.1μm，光谱弯曲小于1.3μm，两者均控制在18%像素以内。分析结果表明，在400至1080nm的可见-近红外（VNIR）光谱区域，调制传递函数（MTF）高于0.9，光谱分辨率约为1.6～5.0nm，光谱透过率大于51.5%。结果表明，该系统在整个光谱范围内具有高透过率和图像质量。
