Design of a dual-grating spectral imaging system based on DMD encoding

RUAN Xiaoxia; LIU Wangyun; NIE Liang; YANG Shiyuan; WANG Yichun

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Design of a dual-grating spectral imaging system based on DMD encoding

Optical Processing and Manufacturing | 更新时间：2025-09-22

- Design of a dual-grating spectral imaging system based on DMD encoding
- OPTICAL TECHNIQUE Vol. 51, Issue 5, Pages: 579-585(2025)
- 作者机构：
  
  西安工业大学光电工程学院，陕西西安 710021
- 作者简介：
- 基金信息：
- DOI：
  CLC： O436.1
- Received：29 April 2025，
  
  Revised：2025-06-02，
  
  Published：20 September 2025
- 稿件说明：
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阮晓霞,刘王云,聂亮等.基于DMD编码的双光栅光谱成像系统设计[J].光学技术,2025,51(05):579-585.

RUAN Xiaoxia,LIU Wangyun,NIE Liang,et al.Design of a dual-grating spectral imaging system based on DMD encoding[J].OPTICAL TECHNIQUE,2025,51(05):579-585.
阮晓霞,刘王云,聂亮等.基于DMD编码的双光栅光谱成像系统设计[J].光学技术,2025,51(05):579-585. DOI：

RUAN Xiaoxia,LIU Wangyun,NIE Liang,et al.Design of a dual-grating spectral imaging system based on DMD encoding[J].OPTICAL TECHNIQUE,2025,51(05):579-585. DOI：

摘要

针对传统编码光谱成像系统存在编码错误率高、像差矫正能力不足等问题，提出基于数字微镜器件（DMD）编码双光栅光谱成像系统，利用对称优化方法及双胶合补偿镜补偿编码DMD引起的残余像差。介绍系统的工作原理及DMD像差矫正，设计出400~700nm波段光谱成像系统，其前置系统焦距85mm、入瞳直径10mm、视场角4°，双光路1:1光栅系统结合DMD同步实现分光、编码与合光功能。设计结果表明，全视场全波段下MTF在奈奎斯特频率76.92lp/mm处均大于0.25，点列图的光斑半径均小于艾里斑，最大光谱分辨率优于1.56nm，满足成像要求。搭建光路进行了光谱成像实验和光谱调制与重构实验，证实了系统对目标场景的成像能力及光谱重构能力，验证了所提方案的可行性。

Abstract

To address the issues of high coding error rates and insufficient aberration correction in traditional coded spectral imaging systems

a dual-grating spectral imaging system based on Digital Micromirror Device （DMD） coding is proposed. This system employs a symmetric optimization method and a doublet compensator to correct residual aberrations induced by the coded DMD. The working principle of the system and DMD-based aberration correction are introduced. A spectral imaging system for the 400-700nm wavelength range is designed

featuring a front-end system with a focal length of 85mm

an entrance pupil diameter of 10mm

and a field of view of 4°. The dual-path 1:1 grating system

combined with the DMD

simultaneously achieves light splitting

coding

and recombination. The design results demonstrate that the Modulation Transfer Function （MTF） exceeds 0.25 at the Nyquist frequency of 76.92lp/mm across the full field of view and spectral range

the spot radii in the spot diagram are all smaller than the Airy disk

and the maximum spectral resolution is better than 1.56nm

meeting the imaging requirements. An optical setup was constructed to conduct spectral imaging experiments and spectral modulation-reconstruction experiments

confirming the system’s imaging capability for target scenes and its spectral reconstruction performance

thereby validating the feasibility of the proposed approach.

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references

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