Li-chang ZOU, Jun HUANG, Zheng-hui LI, Yao DENG, Guo-dong SHAO, Zhen RUAN, Zhi-min LU, Shun-chun YAO. Research on Correction Method of Background Signal Drift in Mid-Infrared Harmonic Detection[J]. Spectroscopy and Spectral Analysis, 2021, 41(2): 408
- Spectroscopy and Spectral Analysis
- Vol. 41, Issue 2, 408 (2021)
Fig. 1. Flow chart of background signal drift correction algorithm
Fig. 2. Experimental schematic of TDLAS
Fig. 3. Absorption line strengths and absorbances of NO, H2O and CO2 with wavenumber from 1 927 to 1 932 cm-1 in HITRAN database
Fig. 4. The 2f signal for different NO concentration levels
Fig. 5. Measured data dots and linear fitting of NO concentration and (Average Vpp)2f
Fig. 6. The drift of the sampling point position of absorption peak
Fig. 7. The 2f background signal without gas absorption and the 2f signals before and after background signal subtraction at two different moments
Fig. 8. The relationship between SNR and the moving sampling point of 2f background signal
Fig. 9. NO concentration obtained by continuous measurement before and after background signal drift correction
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