Diffraction characteristics analysis for DMD-based scene projectors in the long-wave infrared

被引：0
|
作者：
Han Q. [1 ,2 ]
Wang J. [1 ]
Xiong Z. [1 ,2 ]
Zhang J. [1 ]
Ma J. [1 ]
Liu Y. [1 ]
Sun Q. [1 ]
机构：
[1] Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun
[2] University of Chinese Academy of Sciences, Beijing
来源：
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | 2017年 / 46卷 / 05期
关键词：
Diffraction characteristics; DMD; IR scene projector; Two dimension grating;
D O I：
10.3788/IRLA201746.0504006
中图分类号：
学科分类号：
摘要：
Diffraction effects play a significant role in DMD-based scene projection in the long-wave infrared band (8-12 μm). The contrast provided by these projector systems can become noticeably worse because of the diffraction effect of the DMD. So it is necessary to analyze the diffraction characteristics of DMD when it is applied to DMD-based scene projector in this wavelength band. Firstly, DMD was treated as a special blazed grating, and a grating diffraction model of DMD was constructed by diffraction theory and Fourier transform. Then, simulation calculation was conducted in MATLAB environment. Finally, the simulation result was verified by experiment of scene projection. It is shown that there exists a suitable illuminating incident angle range to achieve high contrast image in the long-wave infrared (8-12 μm) band. When incident azimuth angle is 0° and incident zenith angle is between 44° and 48°, the scene projector will have a good imaging contrast. © 2017, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.
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