Chuan Lin, Renzhi Hu, Pinhua Xie, Shengyang Wu, Jinzhao Tong, Zhiyan Li, Fengyang Wang, Yihui Wang. Simultaneous Measurement of Nitrogen Dioxide and Organic Nitrate Based on Thermal Dissociation Cavity Ring-Down Spectroscopy[J]. Acta Optica Sinica, 2020, 40(12): 1201003
- Acta Optica Sinica
- Vol. 40, Issue 12, 1201003 (2020)
Fig. 1. Schematic of the TD-CRDS system
Fig. 2. Cross section of NO2, O3, water vapour and diode laser spectrum. (a) Cross section of O3 and water vapour; (b) cross section of NO2 and diode laser spectrum
Fig. 3. Fitting results of cavity ring-down signal without NO2
Fig. 4. Temperature distribution in quartz glass tube at flow rate of 1 L/min
Fig. 5. Temperature fluctuation at 450 ℃
Fig. 6. Comparison of dual-channel consistency. (a) Time series of NO2 concentration between the two channels; (b) correlation plot between the data from two channels
Fig. 7. Detection limit of CRDS system. (a) Continuous of NO2 concentration sampled only under zero air; (b) Allan deviation plot for NO2 concentration in CRDS system, in which the minimum value equals the optimum integration time
Fig. 8. Comparison of CRDS and LP-DOAS. (a) Time series of NO2 concentration sampled by CRDS and LP-DOAS; (b) correlation plot between the data from CRDS and LP-DOAS
Fig. 9. Time series of ON and NO2 concentration during October 16 to 23, 2019
Fig. 10. Daily average variation during the observation
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