Fig. 1. Diagram of Offner imaging spectrometer

Fig. 2. Schematic of blazed grating

Fig. 3. Structure of Lamina groove grating

Fig. 4. Simulation curves of diffraction efficiency of rectangular groove convex grating. (a) Under different groove depths; (b) under different wavelengths

Fig. 5. Simulation curves of diffraction efficiency of triangular groove convex grating. (a) Under different angles; (b) under different wavelengths

Fig. 6. Process diagram of convex grating

Fig. 7. Deviation curves along Y-axis of machine under different conditions. (a) Under effect of wavefront; (b) under effect of ghost line; (c) standard deviation under effect of stray light

Fig. 8. Influence of residual fillet of diamond grave on diffraction efficiency of grating. (a) residual fillet diagram; (b) diffraction efficiency of grating with different residual fillet

Fig. 9. Real picture of developed convex grating

Fig. 10. Topography of zero-order optical wavefront of convex grating

Fig. 11. Profile of convex grating surface. (a) Surface profile of convex grating; (b) profile of convex grating

Fig. 12. Diagram of grating diffraction efficiency testing device

Fig. 13. Diffraction efficiency curve of convex blazed grating

Fig. 14. Proposed system. (a) Structure of imaging spectrometer; (b) SWIR imaging spectrometer; (c) small airborne hyperspectral system

Fig. 15. Hyperspectral data and SNR ratio curve obtained from flight experiment. (a) Hyperspectral image cube; (b) radiance spectral curve of typical ground objects; (c) SNR curve