谐衍射双波段红外超光谱探测系统研究

根据谐衍射元件的特殊色散原理及红外波段的窗口特性，将谐衍射透镜应用于红外超光谱探测器中.阐述了利用衍射光学元件色散特性的新型红外双波段超光谱探测成像的基本原理，给出了具体的系统设计实例.设计结果表明，此系统提高了图像的分辨率,增大了接收光能量的能力.在两个波段内同时较好地完成了系统的像差校正，波前差都小于1/4波长.在20线对/mm时, 光学传递函数在这两个波段内的各个变焦位置均达到衍射极限. 关键词： 谐衍射元件 超光谱探测 光学设计

Study on hyperspectral detection system with the harmonic diffractive element in infrared dual-band

In this paper, the application of harmonic diffractive element(HDE) in the infrared hyperspectral detection system is investigated based on the special large dispersion capability of HDE and window character of infrared bands. The fundamental principle of the new infrared hyperspectral imaging is described, and a design sample is presented. It is shown that the resolution is improved and the optical power received is enlarged. The rectification of the ray aberrations in both band has been simultaneously accomplished. Wave front aberrations are less than 1/4 wavelength,and the modulation transfer function of the dual-band in every zoom focus location approaches or attains the diffraction limit of 20 cycles/mm.