Li MA, Xin-li FAN, Shuo ZHANG, Wei-feng WANG, Gao-ming WEI. Research on CH4 Gas Detection and Temperature Correction Based on TDLAS Technology[J]. Spectroscopy and Spectral Analysis, 2021, 41(11): 3632
- Spectroscopy and Spectral Analysis
- Vol. 41, Issue 11, 3632 (2021)
Fig. 1. The structureof CH4 detection using TDLAS technology
Fig. 2. Second harmonic signal
Fig. 3. Variation trend of CH4 concentration at different temperature
Fig. 4. CH4 absorption line intensity curve with temperature change
Fig. 5. Half width at half-maximum of CH4 absorption line varies with temperature
Fig. 6. CH4 line intensity and half width at half-maximum vary with temperature relative rate
Fig. 7. BP neural network and PSO-BP model forecast output
Fig. 8. Histogram of relative error distribution
(a): BP neural network; (b): PSO-BP model
(a): BP neural network; (b): PSO-BP model
Fig. 9. Experimental data graph before and after 0.04% CH4 compensation
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Table 1. Prediction evaluation indexes of the two algorithms
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