Qianyao Zhuang, Bin Zhou, Yihong Wang, Rong Zhao, Bubin Wang, Pinbo Duan. Gas Concentration Measurement Method Based on Fixed Wavelength Modulation Spectroscopy[J]. Acta Optica Sinica, 2021, 41(23): 2330001
- Acta Optica Sinica
- Vol. 41, Issue 23, 2330001 (2021)
Fig. 1. Schematic of gas concentration measurement equipment
Fig. 2. Experimental flow chart
Fig. 3. Variation of modulation depth over time
Fig. 4. Transmitted light intensity of reference optical path
Fig. 5. Corresponding relations between harmonic height and wavenumber offset of reference optical path
Fig. 6. Concentration inversion and residuals. (a) Gas concentration before and after correction; (b) residuals before and after correction
Fig. 7. Wavenumber offset of laser emission center
Fig. 8. Error comparison before and after correction at different offsets
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Table 1. Parameter setting of two optical paths
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