Fig. 1. Optical layout of atmospheric monitoring spectrometer

Fig. 2. Schematic of atmospheric monitoring spectrometer optical system

Fig. 3. Cross-section of telescope. (a) Along track; (b) across track

Fig. 4. 3D model of telescope mirrors. (a) Primary mirror; (b) secondary mirror

Fig. 5. Key steps of freeform aluminum mirror manufacturing and test. (a) Turning process; (b) non-contact profile measurement process

Fig. 6. Telescope components after optical alignment

Fig. 7. Optical path diagram of integrated slit assembly, B1 relay optics and B1 spectrometer

Fig. 8. Integrated slit assembly and correlative components

Fig. 9. Integrating process of slit assembly. (a) Distance measurement between two edges by OGP; (b) test image displaying

Fig. 10. B4 spectrometer optical system

Fig. 11. MTF of B4 band at 2355 nm. (a) Spectral direction; (b) space direction

Fig. 12. ILS test results of 4 bands. (a) B1; (b) B2; (c) B3; (d) B4

Fig. 13. SNR test results. (a) B1 band; (b) B2 band of 300‒320 nm; (c) B2 band of 320‒380 nm; (d) B2 band of 380‒490 nm; (e) B3 band; (f) B4 band