Fig. 1. Multi-component gas hollow-core anti-resonant fiber-optic enhanced Raman spectroscopy detection platform

Fig. 2. Fiber optic gas chamber adaptor

Fig. 3. Raman spectrum of H₂ in the low wave number region

Fig. 4. The relationship between SNR of H₂ and the number of selected CCD rows and the radius size of diaphragm

Fig. 5. Comparing the Raman spectrum of H₂ before and after noise reduction

Fig. 6. Raman spectrum of N₂ and O₂ in air

Fig. 7. Raman spectrum of H₂ and quantitative analysis model diagram

Fig. 8. Raman spectrum of CO and quantitative analysis model diagram

Fig. 9. Raman spectrum of CO₂ and quantitative analysis model diagram

Fig. 10. Raman spectrum of CH₄ and quantitative analysis model diagram

Fig. 11. Raman spectrum of C₂H₂ and quantitative analysis model diagram

Fig. 12. Raman spectrum of C₂H₆ and quantitative analysis model diagram

Fig. 13. Raman spectrum of C₂H₄ and quantitative analysis model diagram

Fig. 14. Raman spectrum of C₂H₂ gas mixture prepared by cracking of CH₄