Fig. 1. Optical layout of FOV optics in Dewar

Fig. 2. Schematic diagram of Dewar packaging with two detectors and corresponding lens groups

Fig. 3. Schematic diagram of mechanical model of cold finger in Dewar

Fig. 4. Heat transfer in Dewar with dual-band detectors and integrated cryogenic optics

Fig. 5. Angle coefficient between two coaxial parallel disks

Fig. 6. Thermal stress simulation of IR detectors on diagonal. (a) Thermal stress simulation of MW detector on diagonal at 65 K and 75 K; (b) thermal stress simulation of LW detector on diagonal at 65 K

Fig. 7. Brazing of TC4 cold finger and Kovar cold plate

Fig. 8. Schematic diagram of alignment between detector and lenses. (a) Structure drawing of cold shield for lenses; (b) assembly drawing of detector, cold plate and cold shield; (c) lens dimensions and accuracy requirement

Fig. 9. Photograph of alignment process between detectors and lenses

Fig. 10. Cooling curves of dual-band lenses in Dewar

Fig. 11. Photo of packaging process of detectors Dewar assembly with integrated optics for GIIS of FY-4. (a) Packaging photo of dual-band IR detectors with integrated optics; (b) photo of dual-band detectors Dewar