Infrared and Laser Engineering, Volume. 51, Issue 3, 20220007(2022)
Development of convex blazed grating in coded aperture spectral imager
Figures & Tables(14)
Fig. 1. Optical path diagram of Offner coded aperture spectral imaging system
Fig. 2. Flow diagram of the design method for a convex blazed grating
Fig. 3. Optical design schematic of the dual-pass Offner spectroscopic system
Fig. 5. Statistical histogram of incident angle, azimuth angle and polarization angle
Fig. 8. Test result of groove fabrication error of the convex blazed grating
Fig. 9. Topography of zero-order optical wavefront of the convex blazed grating
Table 1. Specifications of coded aperture spectral imager
View tableView in ArticleTable 1. Specifications of coded aperture spectral imager
Parameters Value Wavelength range/μm 3-5 F-number 3.0 Focal length/mm 240 Spatial resolution/mrad ≤0.1 Spectral resolution/nm 100 Detector array size 640×512 Detector pixel size/μm 15 DMD array size 1920×1080 DMD micromirror size/μm 10.8
Table 2. Specifications of the dual-pass Offner spectroscopic sytem
View tableView in ArticleTable 2. Specifications of the dual-pass Offner spectroscopic sytem
Parameters Value Wavelength range/μm 3-5 Object plane size/mm2 9.6×7.68 Object space NA 0.164 Spectral resolution/nm 100 Dispersion distance/mm 2.4 Optical magification 1
Table 3. Design result of the dual-pass Offner spectroscopic sysytem
View tableView in ArticleTable 3. Design result of the dual-pass Offner spectroscopic sysytem
Parameters Value ${R_{\rm{G}}}$ /mm120 ${R_{\rm{M}}}$ /mm240 ${L_{{\rm{GM}}} }$ /mm117.827 ${L_{\rm{O}}}$ /mm242.826 ${L_{\rm{D}}}$ /mm235.866 $ \Delta H $ /mm41 $ d $ /μm100 $ m $ -1 Length of the grating/mm 102 Width of the grating/mm 46
Table 4. Initial Parameters of the PSO optimization algorithm
View tableView in ArticleTable 4. Initial Parameters of the PSO optimization algorithm
Parameters Value Number of particles 20 Maximum number of generations 100 Inertia factor $ {k_1} $ 0.8 Constriction factor of individual $ {k_2} $ 0.5 Constriction factor of swarm $ {k_3} $ 0.5 Core function RCWA Coating material Gold Substrate material Copper Dimension 2 Number of spectrum channels 20 Variables $ \gamma $ &$ h $
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Yushi Zhao, Wenjun He, Zhiying Liu, Yuegang Fu. Development of convex blazed grating in coded aperture spectral imager[J]. Infrared and Laser Engineering, 2022, 51(3): 20220007
Paper Information
Category: Optical devices
Received: Dec. 31, 2021
Accepted: --
Published Online: Apr. 8, 2022
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