Journal of Infrared and Millimeter Waves, Volume. 42, Issue 1, 50(2023)

Efficient information acquisition spectral imaging system based on multi-field slits

Shi-Jie LIU1,2, Xing-Yu ZHANG1, Hao ZHOU1, Chun-Lai LI1,2, Dong Jing LI1, Hong-Xing QI1,2、*, and Jian-Yu WANG1,2,3、**
Author Affiliations
  • 1Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou 310024,China
  • 2Key Laboratory of Space Active Opto-Electronics Technology,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China
  • 3University of Chinese Academy of Sciences,Beijing 100049,China
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    Figures & Tables(19)
    The schematic diagram of the detector display under the slit scanning mode of the SSHI system
    The process of constructing a solution model
    Comparison of three spectral imaging methods,(a)the slit scanning mode of the SSHI system,(b)the uncoupled slit array scanning of uSASHI,(c)the coded slit array scanning of cSASHI
    The schematic diagram
    Mechanical design
    The optical layout of the spectrometer components
    Physical view of different types of slits (a) single slit, (b) uniform array slit, (c) coded array slit
    Center field spectral calibration results
    Spectral calibration results for 5 typical fields of view (a) center wavelength, (b) spectral resolution
    Imaging objectives and preliminary imaging results (a) RGB Image, (b) sampling images, (c) imaging without synchronization correction
    Different wavelength images
    Reflectance curves (a)~(d): reflectance curves corresponding to positions 1~4 respectively
    Outdoor imaging physical picture (a) target in the red box, (b) system physical
    Outdoor panchromatic channel imaging and spectral imaging results (a) panchromatic channel imaging, (b) single-band image of 30 channels
    Results of 10 Hz video spectral imaging implemented by uSASHI (a)-(e) are the results of continuous 1s spectral imaging(half of them)
    Spectral imaging results of cSASHI at different sampling rates (a)-(e) Spectral imaging results at 16.6 Hz for 60% sampling rate, 14.3 Hz for 70% sampling rate, 12.5 Hz for 80% sampling rate, 11 Hz for 90% sampling rate, and 10 Hz for 100% sampling rate, respectively
    • Table 1. Specifications of the system

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      Table 1. Specifications of the system

      ParametersPanchromatic imaging channelSpectral imaging channel
      Wavelength0.45~0.85 μm0.45~0.9 μm
      Focal length1 725 mm1 725 mm
      Working F number5.55.5
      Spectral sampling15 nm
      Field of view±0.370°×±0.278°±0.221°×±0.111°
      Spatial resolution

      0.002 mrad

      (1 m@500 km)

      0.007 6 mrad

      (3.8 m@500 km)

      Spectral resolution18 nm
      Spectrometer magnification
      Detector array size6 464×4 8521 024×512
      Detector pixel size3.45 μm13 μm
    • Table 2. Specifications of the spectrometer components

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      Table 2. Specifications of the spectrometer components

      ParametersSpectrometer components
      Spectral range0.45~0.9 μm
      Spectrometer magnification
      Object size±6.656 mm×±3.328 mm
      Spectroscopic elementPrism pairs
      Spectral sampling15 nm
      RMS radius of spot≤4.5 μm
      Smile<3.1 μm
      Keystone<4.2 μm
      MTF(@38.46 lp/mm)

      >0.73@0.45 μm;>0.73@0.65 μm;

      >0.69@0.9 μm

    • Table 4. Smile of the system

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      Table 4. Smile of the system

      Slit positionWavelengthSmile/mm
      Top edge450 nm0.003 56
      650 nm0.002 84
      850 nm0.002 67
      Centre450 nm0.002 95
      650 nm0.004 44
      850 nm0.004 86
      Bottom edge450 nm0.002 95
      650 nm0.004 44
      850 nm0.004 86
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    Shi-Jie LIU, Xing-Yu ZHANG, Hao ZHOU, Chun-Lai LI, Dong Jing LI, Hong-Xing QI, Jian-Yu WANG. Efficient information acquisition spectral imaging system based on multi-field slits[J]. Journal of Infrared and Millimeter Waves, 2023, 42(1): 50

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    Paper Information

    Category: Research Articles

    Received: Jun. 21, 2022

    Accepted: --

    Published Online: Feb. 23, 2023

    The Author Email: Hong-Xing QI (qihongxing@ucas.ac.cn), Jian-Yu WANG (jywang@mail.sitp.ac.cn)

    DOI:10.11972/j.issn.1001-9014.2023.01.008

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