Spectroscopy and Spectral Analysis, Volume. 41, Issue 10, 3256(2021)
Research on Gas Concentration Measurement Method Based on Gradient Descent Method to Fit Spectral Absorption Signal Directly
Figures & Tables(8)
Fig. 3. Point selection for initial value calculation of incident laser intensity parameters
Fig. 5. Fitting results at different concentrations
(a): 10%; (b): 12%; (c): 14%; (d): 16%; (e): 18%; (f): 20%
Fig. 6. Absorbance at different concentrations obtained by routine baseline fitting
Table 1. Spectral parameters of two absorption lines of CO2 around 1 580 nm (296 K)
View tableView in ArticleTable 1. Spectral parameters of two absorption lines of CO2 around 1 580 nm (296 K)
Line Wavelength
/nmLinestrength S
[cm-1·(molecule·cm-2)-1]Self-broadening
γself/(cm-1·atm-1)Air-broadening
γair/(cm-1·atm-1)Line1 1 580.512 7 1.301×10-23 0.096 0.071 6 Line2 1 580.039 5 1.431×10-23 0.098 0.072 7
Table 2. Analyze the results of direct fitting method and integral area method
View tableView in ArticleTable 2. Analyze the results of direct fitting method and integral area method
实际浓度 直接拟合法拟合浓度 相对误差1 拟合方差 积分面积法计算浓度 相对误差2 10% 10.37% 3.70% 9.27×10-5 9.07% -9.30% 12% 12.53% 4.40% 3.29×10-5 11.49% -4.25% 14% 14.57% 4.07% 6.39×10-5 12.96% -7.43% 16% 16.14% 0.90% 1.85×10-5 15.29% -4.44% 18% 17.70% -1.65% 8.32×10-5 17.11% -4.94% 20% 19.79% -1.03% 6.92×10-5 19.18% -4.10%
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. Research on Gas Concentration Measurement Method Based on Gradient Descent Method to Fit Spectral Absorption Signal Directly[J]. Spectroscopy and Spectral Analysis, 2021, 41(10): 3256
Paper Information
Category: Research Articles
Received: Oct. 10, 2020
Accepted: --
Published Online: Oct. 29, 2021
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