Xiang Chen, Ruifeng Kan, Chenguang Yang, Mai Hu, Lu Yao, Xueli Fan, Yabai He, Xiaofan Pei, Jianguo Liu. Concentration Measurements of NO2 and NH3 Based on Wavelength-Modulation Frequency-Division-Multiplexing Spectroscopic Technique[J]. Acta Optica Sinica, 2018, 38(5): 0512004
- Acta Optica Sinica
- Vol. 38, Issue 5, 0512004 (2018)
Fig. 1. Simulated absorption spectra of gases
Fig. 2. Simulated second harmonic signals of absorption spectra
Fig. 3. Schematic of experimental apparatus
Fig. 4. Normalized second harmonic peak value under different modulation voltages. (a) NO2; (b) NH3
Fig. 5. Second harmonic signals measured under different conditions. (a) NO3; (b) NH3
Fig. 6. Calibration curves. (a) NO2; (b) NH3
Fig. 7. Detection limits. (a) NO2; (b) NH3
Fig. 8. Concentration measument curves during one day. (a) NO2; (b) NH3
Fig. 9. Average concentration measured by WMS. (a) NO2; (b) NH3
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