Acta Photonica Sinica, Volume. 53, Issue 1, 0130001(2024)
Simulation Analysis of Key Parameters for CH4Gas Point Source Detection Based on F-P Interferometer
Figures & Tables(18)
Fig. 2. Diagram of CH4 detection system based on F-P interferometric spectral imager
Fig. 5. Upward radiation absorption characteristics of the atmosphere under different CH4 concentrations
Fig. 7. Detector interference ring pattern at original concentration
Fig. 8. Instrument output signal with original concentration and concentration change of 25%
Fig. 9. The relative change in the output signal of the instrument with a concentration change of 25%
Fig. 10. Change in cavity length，the relative change of interference signal
Fig. 11. Change in intracavity reflectivity，the relative change of interference signal
Fig. 12. Detection signal-to-noise ratio under different reflectivity
Fig. 13. Cut-off filter range change，the relative change of interference signal
Table 1. Parameters of F-P interferometer
View tableView in ArticleTable 1. Parameters of F-P interferometer
Parameter Value Wavelength band 1 630~1 675 nm Central wavelength 1 650 nm Free spectral range 12.5 nm Clear aperture 22 mm Spectral resolution 0.1 nm Cavity length h 0.11 mm Intracavity reflectance R 97.5% Index of refraction of medium n 1
Table 2. Parameters of optical system
View tableView in ArticleTable 2. Parameters of optical system
Optical system Focal length/mm 2ω/° D/mm Magnification Integrated optical system 321.25 1.37 80 \ Telescopic system \ 1.37 80 1/3.65 Imaging system 88 5 22 \
Table 3. Change in cavity length，the relative change extreme value of the interference signal
View tableView in ArticleTable 3. Change in cavity length，the relative change extreme value of the interference signal
Cavity length/mm Mmax/% Mmin/% Cavity length /mm Mmax/% Mmin/% 0.05 3.02 0.93 0.13 2.20 0.80 0.06 4.03 0.83 0.14 2.43 0.42 0.07 2.69 0.76 0.15 2.41 0.42 0.08 4.32 0.65 0.16 2.63 0.31 0.09 3.34 0.42 0.17 1.78 0.33 0.10 2.21 0.45 0.18 3.57 0.16 0.11 2.14 0.44 0.19 2.35 0.20 0.12 3.52 0.47 0.20 2.56 0.24
Table 4. Change in intracavity reflectivity，the relative change extreme value of the interference signal
View tableView in ArticleTable 4. Change in intracavity reflectivity，the relative change extreme value of the interference signal
Intracavity reflectivity/% Mmax/% Mmin/% Intracavity reflectivity/% Mmax/% Mmin/% 90 2.09 1.05 95 3.04 0.87 90.5 2.16 1.04 95.5 3.21 0.84 91 2.22 1.03 96 3.41 0.79 91.5 2.29 1.02 96.5 3.65 0.75 92 2.37 1.01 97 3.95 0.70 92.5 2.45 0.99 97.5 4.32 0.65 93 2.54 0.98 98 4.81 0.59 93.5 2.65 0.96 98.5 4.59 0.52 94 2.76 0.94 99 6.57 0.46 94.5 2.89 0.91 99.5 7.39 0.34
Table 5. Cut-off filter range change，the relative change extreme value of the interference signal
View tableView in ArticleTable 5. Cut-off filter range change，the relative change extreme value of the interference signal
Spread/nm Mmax/% Mmin/% Narrow/nm Mmax/% Mmin% 2 4.31 0.65 2 4.32 0.65 4 4.27 0.64 4 4.33 0.65 6 4.02 0.62 6 4.34 0.64 8 3.25 0.54 8 3.75 0.52
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Qiang ZHANG, Caixun BAI, Di FU, Juan LI, Chenguang CHANG, Hengxiang ZHAO, Sufeng WANG, Yutao FENG. Simulation Analysis of Key Parameters for CH4Gas Point Source Detection Based on F-P Interferometer[J]. Acta Photonica Sinica, 2024, 53(1): 0130001
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Received: May. 30, 2023
Accepted: Jul. 17, 2023
Published Online: Feb. 1, 2024
The Author Email: FENG Yutao (fytciom@126.com)
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