Infrared and Laser Engineering, Volume. 52, Issue 1, 20220284(2023)
Wide-range multi-gas detection method based on wavelength modulation spectroscopy and direct absorption spectroscopy
Figures & Tables(11)
Fig. 4. Results of gases concentration detected by two methods and relative errors
Fig. 5. Measurement process and settling time of in wide range CH4 by the detection system
Fig. 6. Measurement result of CH4 in wide range by the detection system
Fig. 7. Measurement process and settling time of CO and C2H2 in wide range
Fig. 8. Measurement result of CO and C2H2 in wide range by the detection system. (a) CO; (b) C2H2
Fig. 9. Second harmonic signals of three kinds of gases. (a) CH4; (b) CO; (c) C2H2
Table 1. Detection index of multi gas detection system
View tableView in ArticleTable 1. Detection index of multi gas detection system
Gas species Measuring range Allowable error Settling time/s CH4 0.00-1.00% ±0.10% < 60 1.00%-40.00% ±10% of true value 40.00%-100.00% ±10% C2H2 (0-50)×10−6 ±2×10−6 < 60 (50-1000)×10−6 ±5% of true value CO (0-100)×10−6 ±4×10−6 < 60 (100-5000)×10−6 ±5% of true value
Table 2. Measurement result of CO and C2H2 in wide range by the detection system
View tableView in ArticleTable 2. Measurement result of CO and C2H2 in wide range by the detection system
Gas species Measuring range Maximal relative error Linear equation R2 Settling time/s CO 10×10−6 4.6% y=0.980 57x+1.153 32 0.999 74 20 20×10−6-5000×10−6 3.66% C2H2 10×10−6-50×10−6 3.4% y=0.994 05x−1.848 18 0.999 58 14 50×10−6-1000×10−6 4.997%
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Xiaohu Zhao, Pengshuai Sun, Zhirong Zhang, Qianjin Wang, Tao Pang, Miao Sun, Feiyu Zhuang. Wide-range multi-gas detection method based on wavelength modulation spectroscopy and direct absorption spectroscopy[J]. Infrared and Laser Engineering, 2023, 52(1): 20220284
Paper Information
Category: Lasers & Laser optics
Received: Apr. 24, 2022
Accepted: --
Published Online: Feb. 9, 2023
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