Fig. 1. Principle of SIF spectral observation

Fig. 2. Optical structure of the telescope system

Fig. 3. MTF curves of the telescope

Fig. 4. P-G dispersive component

Fig. 5. Imaging spectrometer light path

Fig. 6. Optical system of the instrument

Fig. 7. Optimized design results of optical system of the instrument. (a) MTF value at the wavelength of 670 nm; (b) MTF value at the wavelength of 725 nm; (c) MTF value at the wavelength of 780 nm; (d) RMS spot radius distribution in all waveband and all fields of view

Fig. 8. Prototype instrument

Fig. 9. Tested MTF curves of the telescope

Fig. 10. Spectral calibration results. (a) Spectral data in the 1000^th line of CMOS; (b) Gaussian fit curve of spectral response at 696.1 nm wavelength

Fig. 11. Test result of SNR

Fig. 12. Schematic diagram of the 3FLD method

Fig. 13. Hyper-spectral images observed by the instrument in the outfield and analysis results of NDVI. (a) Pseudo colors hyper-spectral image observed by the instrument; (b) infrared reflected radiation mapping image at the wavelength of 750 nm; (c) NDVI mapping image; (d) SIF mapping image; (e) canopy reflected spectrum and NDVI analysis result