• Acta Optica Sinica
  • Vol. 45, Issue 6, 0622002 (2025)
Bolun Cui1,*, Ning An1, Chiming Tong1, Zhaoying Zhang2..., Zhiwen Chen3, Yunbin Yan1, Bingxiu Fang1, Bicen Li1 and Yongchang Li4|Show fewer author(s)
Author Affiliations
  • 1General Research Office of Infrared and Spectral Technology, Beijing Institute of Space Mechanics and Electricity, Beijing 100094, China
  • 2International Institute of Earth System Science, Nanjing University, Nanjing 210023, Jiangsu , China
  • 3National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, Anhui , China
  • 4Aerospace Dongfanghong Satellite Co., Ltd., Beijing 100094, China
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    DOI: 10.3788/AOS240883 Cite this Article Set citation alerts
    Bolun Cui, Ning An, Chiming Tong, Zhaoying Zhang, Zhiwen Chen, Yunbin Yan, Bingxiu Fang, Bicen Li, Yongchang Li. Design and Evaluation of Mid-Resolution Ultraspectral Imager for SIF Detection[J]. Acta Optica Sinica, 2025, 45(6): 0622002 Copy Citation Text show less
    Function and composition diagram of MIRUS
    Fig. 1. Function and composition diagram of MIRUS
    Optical layout of MIRUS
    Fig. 2. Optical layout of MIRUS
    MTF of optical system@7 lp/mm. (a) 0.670 μm; (b) 0.725 μm; (c) 0.780 μm
    Fig. 3. MTF of optical system@7 lp/mm. (a) 0.670 μm; (b) 0.725 μm; (c) 0.780 μm
    Spot diagrams on different parts of FOV
    Fig. 4. Spot diagrams on different parts of FOV
    Spectral slit function. (a)‒(c) (0, 0), (0.805, 0), (1.500, 0) field of view at 0.670 μm; (d)‒(f) (0, 0), (0.805, 0), (1.500, 0) field of view at 0.725 μm; (g)‒(i) (0, 0), (0.805, 0), (1.500, 0) field of view at 0.780 μm
    Fig. 5. Spectral slit function. (a)‒(c) (0, 0), (0.805, 0), (1.500, 0) field of view at 0.670 μm; (d)‒(f) (0, 0), (0.805, 0), (1.500, 0) field of view at 0.725 μm; (g)‒(i) (0, 0), (0.805, 0), (1.500, 0) field of view at 0.780 μm
    Diffraction efficiency of different blazing angles and anti-blazing angles. (a) TE polarization; (b) TM polarization; (c) no polarization
    Fig. 6. Diffraction efficiency of different blazing angles and anti-blazing angles. (a) TE polarization; (b) TM polarization; (c) no polarization
    Diffraction efficiency of optimized grating
    Fig. 7. Diffraction efficiency of optimized grating
    Layout of the spectrometer
    Fig. 8. Layout of the spectrometer
    Instrument line shape (ILS) for different wavelengths. (a) 673.5 nm; (b) 725.0 nm; (c) 779.0 nm
    Fig. 9. Instrument line shape (ILS) for different wavelengths. (a) 673.5 nm; (b) 725.0 nm; (c) 779.0 nm
    FWHM for different wavelengths
    Fig. 10. FWHM for different wavelengths
    Smile for different wavelengths
    Fig. 11. Smile for different wavelengths
    Keystone for different wavelength bands
    Fig. 12. Keystone for different wavelength bands
    SNR for different wavelength bands
    Fig. 13. SNR for different wavelength bands
    Performance evaluation flow chart of MIRUS
    Fig. 14. Performance evaluation flow chart of MIRUS
    Radiance performance of MIRUS. (a) Simulated typical entrance pupil radiance; (b) SNR under typical radiance conditions
    Fig. 15. Radiance performance of MIRUS. (a) Simulated typical entrance pupil radiance; (b) SNR under typical radiance conditions
    SNR of SIFIS
    Fig. 16. SNR of SIFIS
    Retrieval accuracy of SIFIS. (a) σFs for different radiance; (b) relative error for different SNR
    Fig. 17. Retrieval accuracy of SIFIS. (a) σFs for different radiance; (b) relative error for different SNR
    Retrieval accuracy of MIRUS. (a) GSD is 100 m; (b) GSD is 200 m
    Fig. 18. Retrieval accuracy of MIRUS. (a) GSD is 100 m; (b) GSD is 200 m
    CharacteristicPerformance
    Wavelength /nm670‒780
    Full width at half-maximum (FWHM) /nm0.3
    Width of swath /km20
    GSD /(km×km)0.1×0.1 (non-binning), 0.2×0.2 (binning)
    Smile /nm0.02
    Keystone /nm0.02
    Signal-to-noise ratio (SNR)200@10 mW·m-2·sr-1·nm-1
    Table 1. Main indicators of MIRUS
    Optical parameterPerformance
    Wavelength /nm670‒780
    F#2
    Focal /mm321
    Pixel size /μm24
    Field of view (FOV) /(°)2.29
    Convex grating frequency /mm-11524.4
    Size /(mm×mm×mm)673×621×231
    Table 2. Overall performance parameters of optical system

    Wavelength /

    μm

    SmileKeystone

    Range /

    μm

    Range of

    pixels /%

    Range /

    μm

    Range of pixels /%
    0.6700.2461.00.803.3
    0.7250.2571.100
    0.7800.1440.60.692.9
    Table 3. Smile and keystone of the instrument
    ItemValue
    Atmospheric modeMid latitude summer
    Aerosol modeRural
    Surface albedo0.3
    Solar zenith /(°)22, 36, 45, 56
    Solar azimuth /(°)0, 55, 70, 72, 75
    Spectral range /nm670‒780
    Spectral resolution /nm0.3
    Spectral sample distance /nm0.1
    Table 4. Input parameters of MODTRAN 6.0
    ParameterSIFISMIRUS
    GSD /(km×km)0.375×0.8000.1×0.1 (non-binning)
    Integration time /ms11414.2
    F#2.682
    Transmittance0.3480.613
    Spectral resolution /nm0.30.3
    Spectral sample distance /nm0.10.1
    Table 5. Comparison of SIFIS and MIRUS design indicators
    Bolun Cui, Ning An, Chiming Tong, Zhaoying Zhang, Zhiwen Chen, Yunbin Yan, Bingxiu Fang, Bicen Li, Yongchang Li. Design and Evaluation of Mid-Resolution Ultraspectral Imager for SIF Detection[J]. Acta Optica Sinica, 2025, 45(6): 0622002
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