光学学报, 2018, 38 (3): 0322001, 网络出版: 2018-03-20
红外双谱段傅里叶变换成像光谱仪光学设计 下载: 837次
Optical Design of Infrared Bispectrum Fourier Transform Imaging Spectrometer
光学设计 中长波 傅里叶变换 成像光谱仪 离轴三反 optical design medium and long wave Fourier transform imaging spectrometer off-axis three mirror
摘要
提出了一种基于静态干涉系统的中长波红外双谱段时空联合调制傅里叶变换成像光谱仪(FTIS), 分别对前置望远系统及后置成像系统进行了设计。根据像差理论, 通过添加约束的方式计算了反射式前置望远系统的初始结构, 通过光学设计软件优化, 矫正了系统中倾斜分束器和补偿器带来的大数量级像散和彗差;在中波和长波双谱段范围内, 前置系统的调制传递函数(MTF)均接近衍射极限。该光谱仪的两个后置成像系统均采用透射式结构, 点列图结果显示, 后置系统成像像斑均方根(RMS)值在双谱段范围均小于7.0 μm。将前置望远系统和后置成像系统进行对接, 最终得到了视场角为1.5°, 中波通道F数为4, 长波通道F数为2的整体光学系统。在双谱段范围内, 整体系统的点列图RMS值小于10.7 μm, MTF在探测器的特征频率17 lp/mm处大于0.5, 具有良好的成像效果。
Abstract
A Fourier transform imaging spectrometer (FTIS) of medium and long wave infrared bispectrum spatiotemporal joint modulation based on static interference system is presented, and the front telephoto system and post-imaging system are designed. According to the theory of aberration, the initial structure of the reflective front telephoto system is calculated by adding the constraint. The large-scale astigmatism and coma aberration caused by the tilt beam splitter and compensation plate in the system are corrected through the optimization of the optical design software. The modulation transfer function (MTF) of the front telephoto system is close to the diffraction limit in the range of the medium wave and long wave bispectrums. The transmission structure is adopted in the two post-imaging systems of the spectrometer. The results of spot diagram show that the root mean square (RMS) values of the imaging spots of the post-imaging systems are less than 7.0 μm in the bispectrum range. The overall optical system is made up of the front telephoto system and the post-imaging system, whose field of view is 1.5°, medium wave channel F number is 4 and long wave channel F number is 2. In bispectrum range, the spot diagram RMS value of the overall system is less than 10.7 μm, and the MTF of the overall system is more than 0.5 at the detector’s characteristic frequency of 17 lp/mm. The overall system has a good imaging effect.
计云兵, 梁静秋, 梁中翥, 吕金光, 秦余欣, 王维彪, 陶金, 孟德佳. 红外双谱段傅里叶变换成像光谱仪光学设计[J]. 光学学报, 2018, 38(3): 0322001. Ji Yunbing, Liang Jingqiu, Liang Zhongzhu, Lü Jinguang, Qin Yuxin, Wang Weibiao, Tao Jin, Meng Dejia. Optical Design of Infrared Bispectrum Fourier Transform Imaging Spectrometer[J]. Acta Optica Sinica, 2018, 38(3): 0322001.