Fig. 1. Packaging structure of Dewar with common optical path

Fig. 2. Stray ratio of critical surfaces. (a) Window; (b) window cap; (c) cold shield; (d) filter; (e) inner shell

Fig. 3. Cold shield blocks two kinds of stray light. (a) Cold screen is not raised; (b) raise the cold screen

Fig. 4. Simulation temperature distribution of multi-wave detector Dewar

Fig. 5. Simulation of the temperature distribution and deformation of the dichroic filter. (a)(c) Temperature distribution; (b)(d) deformation characteristics

Fig. 6. Design principle of cold shield blade of multi-wave detector

Fig. 7. Four cold shields. (a) Two vanes; (b) three vanes; (b) four vanes; (b) five vanes

Fig. 8. PST of cold shield (IR3)

Fig. 9. PST cold shield (IR2)

Fig. 10. Sample and magnified view of three blackened surfaces. (a) Graphene blackened coating; (b) black nickel plating; (c) polyimide plating

Fig. 11. Reflectivity of three blackened surfaces

Fig. 12. PST of cold shield with different surfaces (IR3)

Fig. 13. PST of cold shield with different surfaces (IR2)