Fig. 1. Variable gap F-P spectral imaging system

Fig. 2. Structure of variable gap F-P interferometer

Fig. 3. Interference intensity of monochromatic light at different pixel location of detector

Fig. 4. Error curves between interference intensity of monochromatic light and standard sine function

Fig. 5. Normalized error at different reflectivity of the interferometric cavity

Fig. 6. Relation curve between reflectivity of interferometric cavity and modulation of interference fringes

Fig. 7. Influence of the reflectivity of interferometric cavity on target function

Fig. 8. Interference pattern for the uniform CO₂ laser source from the system

Fig. 9. Interferometric information from the CO₂ laser source

Fig. 10. Spectrum curve of the CO₂ laser