Zihao Yuan, Yinbo Huang, Qing Zhong, Xingji Lu, Jun Huang, Leilei Zhang, Gang Qi, Zhensong Cao. Design and Study of Absorption Spectrum Measurement Device with V-Shaped Off-Axis Integrated Cavity[J]. Chinese Journal of Lasers, 2023, 50(19): 1911002
- Chinese Journal of Lasers
- Vol. 50, Issue 19, 1911002 (2023)
Fig. 1. Simulation diagram of V-shaped cavity
Fig. 2. Spot distributions on M1 and M2 surfaces at different angles
Fig. 3. Spot distributions on lens M2 surface at different off-axis incidence angles
Fig. 4. Intensity distributions of light emitting from surface of cavity mirror for V-OA-ICOS and OA-ICOS. (a) V-OA-ICOS; (b) OA-ICOS
Fig. 5. Structure design of V-shaped cavity
Fig. 6. V-OA-ICOS experimental measuring device
Fig. 7. Cavity mode signals at different off-axis incidence angles.(a) γ1; (b) γ2; (c) γ3
Fig. 8. Measurement data of V-OA-ICOS device. (a) CO2 absorption spectrum; (b) residual of Voigt fitting
Fig. 9. Measurement results of standard CO2 gas with volume fraction of 400×10-6 during 50 min. (a) Stability test; (b) Allan variance
Fig. 10. Simulated absorption spectra of CO2, H2O, and NH3 near 4987 cm-1
Fig. 11. NH3 absorption spectrum and Savitzky-Golay smoothing results at different window widths. (a) Raw absorption spectrum; spectral data obtained after smoothing by Savitzky-Golay algorithm when window width is (b) 30, (c) 40, (d) 50, (e) 60, and (f) 70
Fig. 12. NH3 absorption spectrum and Voigt fitting residual of V-OA-ICOS device. (a) Before smoothing by Savitzky-Golay algorithm; (b) after smoothing by Savitzky-Golay algorithm
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