Fig. 1. Schematic diagram of hyperspectral imaging principle

Fig. 2. Structure diagram of rotating filter imaging spectrometer

Fig. 3. (a) Schematic diagram of filter wheel used in NIRSpec (b) Auxiliary structure diagram of filter wheel

Fig. 4. Schematic diagram of filter wheel on MIRI

Fig. 5. Exploded view of the design of the filter wheel mechanism

Fig. 6. Schematic diagram of the LCTF imaging spectrometer

Fig. 7. Structure diagram of primary Lyot filter

Fig. 8. Optical path diagram of HPI on Rising-2

Fig. 9. Design diagram of AOTF filter in VNIS

Fig. 10. Schematic diagram of resonant layer thickness of wedge filter

Fig. 11. Schematic diagram of LVF structure and light splitting

Fig. 12. (a) Schematic diagram of microwave-assisted pulse-DC rotating drum sputtering deposition system; (b) Schematic diagram of LVF

Fig. 13. Light energy transmittance of filter

Fig. 14. Principle diagram of LVF and TDI

Fig. 15. Schematic diagram of the arrangement of the filter array^[25]

Fig. 16. (a) Bayer pattern of the filter; (b) Image under the microscope

Fig. 17. Experimental optical path of the spectrometer, from right to left is a photographic objective, a filter, a relay objective, and a panchromatic image receiver

Fig. 18. Schematic diagram of 3D data cube and detector pixel coating

Fig. 19. Physical map of filter

Fig. 20. (a) Schematic diagram of filter aligned with detector; (b) Schematic diagram of the actual experimental setup

Fig. 21. (a) Schematic diagram of 16-channel pixel-level filter; (b) Image under microscope

Fig. 22. Complete machine diagram of 16-channel imaging spectrometer

Fig. 23. Illustration of colloidal quantum dot spectrometer system^[32]

Fig. 24. Schematic diagram of the proposed NIR QD spectrometer^[34]