Optics and Precision Engineering, Volume. 33, Issue 11, 1691(2025)
Enhancing sensitivity of multi-pass cavity enhanced Raman gas detection
Figures & Tables(12)
Fig. 1. Schematic diagram of the Raman apparatus with multiple reflection cavity enhancement
Fig. 2. Optical simulation and actual spot patterns of different reflection modes
Fig. 3. Comparison of Raman scattering signal intensities for three reflection modes
Fig. 4. Effect of collection system angle on intensity of Raman scattering signals
Fig. 5. Influence of P-polarization and S-polarization on intensity of Raman scattering signals
Fig. 6. Signal intensity of single-path collection and dual-path collection in collection system
Fig. 9. Relationship between Raman scattering signal intensity and gas concentration
Table 1. Signal intensity and signal-to-noise ratio for three different reflection modes
View tableView in ArticleTable 1. Signal intensity and signal-to-noise ratio for three different reflection modes
Reflection mode Signal strength/counts Noise intensity/counts SNR Coelom 956 40 23.9 Near-common chamber elliptical 2 409 43 56.0 Near-symcentric chamber linear 3 489 46 75.8
Table 2. Signal intensity and signal-to-noise ratio for five collection system angles
View tableView in ArticleTable 2. Signal intensity and signal-to-noise ratio for five collection system angles
Collect system angle/（°） Signal strength/count Noise intensity/count SNR 30 22 001 87 252.9 45 15 013 80 187.7 60 7 565 78 97.0 75 3 397 83 41.0 90 1 469 82 18.2
Table 3. Signal intensity and signal-to-noise ratio for dual-path collection and single-path collection
View tableView in ArticleTable 3. Signal intensity and signal-to-noise ratio for dual-path collection and single-path collection
Branch collection and dual collection Signal strength/count Noise intensity/count SNR A road 25 217 76 331.8 B road 21 148 72 293.7 B road+A road 40 344 81 498.1
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Shangjin LI, Tenglong DING, Yanqun ZHANG, Dianqiang SU, Zhonghua JI, Weiguang MA, Yanting ZHAO. Enhancing sensitivity of multi-pass cavity enhanced Raman gas detection[J]. Optics and Precision Engineering, 2025, 33(11): 1691
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Received: Mar. 5, 2025
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Published Online: Aug. 14, 2025
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