Design of MWIR Hadamard coded imaging spectrometer

被引：0
|
作者：
Yang Y. [1 ]
Hu B. [1 ]
Li L. [1 ]
Wang S. [1 ]
Yan Q. [1 ]
机构：
[1] CAS Key Laboratory of Spectral Imaging Technology, Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an
来源：
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | 2022年 / 30卷 / 06期
关键词：
Digital mirror devices; Hadamard transform spectral imager; MWIR spectral imaging; Optical designing;
D O I：
10.37188/OPE.20223006.0641
中图分类号：
学科分类号：
摘要：
In a space Hadamard transform spectral imager (SHTSI) system, encoding the template using digital mirror devices (DMDs) can ensure that the system is miniaturized and lightweight, and has high resolution and high frame rate. However, modulation using DMD causes the focus plane of SHTSI to tilt; consequently, the resultant image obtained from the spectrometer does not match the cooled shield of the detector. This causes image degradation and field of view loss. In this paper, a novel SHTSI system design is proposed to improve the quality of the final image. The design also addresses the issues of cold stop aperture mismatch and field of view accuracy. In this scheme, the design of the front lens contains a tilted and off-center lens, which tilts the image of the object by 24° with respect to the primary focus plane. Based on this method, a SHTSI optical system is designed, and the spot diagram RMS of the full field of the system was calculated to be less than 5 µm. This ensures that the system generates an even image. According to this design scheme, a SHTSI principle model machine is developed. The experiment results show that the evaluation of the restored spectral angular distance of the SHTSI system is better than 0.052. © 2022, Science Press. All right reserved.
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页码：641 / 650
页数：9
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