Optical Design of Infrared Bispectrum Fourier Transform Imaging Spectrometer

Table 1. Main specifications of the imaging spectrometer
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Table 1. Main specifications of the imaging spectrometer
Parameter Value
Wavelength coverage 3.7-4.8 μm, 8-12 μm
Spatial resolution 0.3 m@2000 m
Modulation transfer function (MTF) >0.5@17 lp/mm

Table 2. Parameters of the front telephoto system
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Table 2. Parameters of the front telephoto system
Parameter Value
Field of view 1.5°
Wavelength coverage 3.7-4.8 μm, 8-12 μm
Focal length 1700 mm
Image spare NA 0.03

Table 3. Initial structural parameters of the front telephoto system
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Table 3. Initial structural parameters of the front telephoto system
Mirror Parameter
Primary r₁=-3585.739, d₁=-872.779, K₁=-1.636
Secondary r₂=-1456.625, d₂=872.779, K₂=-0.755
Tertiary r₃=-1745.598, d₃=-1090.974, K₃=0.041

Table 4. Optimized structural parameters of the front telephoto system
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Table 4. Optimized structural parameters of the front telephoto system
Mirror Parameter
Primary r₁=-3037.247, d₁=-780, K₁=-0.975
Secondary r₂=-1262.266, d₂=780, K₂=-0.022
Tertiary r₃=-1638.680, d₃=-991.932, K₃=0.084

Table 5. Parameters of medium wave post-imaging system
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Table 5. Parameters of medium wave post-imaging system
Parameter Value
Height of object 22.5 mm
Wavelength coverage 3.7-4.8 μm
Magnification 0.24
Object NA 0.03

Table 6. Parameters of long wave post-imaging system
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Table 6. Parameters of long wave post-imaging system
Parameter Value
Height of object 22.5 mm
Wavelength coverage 8-12 μm
Magnification 0.12
Object NA 0.03

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Ji Yunbing, Liang Jingqiu, Liang Zhongzhu, Lü Jinguang, Qin Yuxin, Wang Weibiao, Tao Jin, Meng Dejia. Optical Design of Infrared Bispectrum Fourier Transform Imaging Spectrometer[J]. Acta Optica Sinica, 2018, 38(3): 322001

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