Biao Wang, Hongfei Lu, Aoqi Li, Yue Chen, Tongxin Dai, Shuo Huang, Houquan Lian. Research of TDLAS methane detection system using VCSEL laser as the light source[J]. Infrared and Laser Engineering, 2020, 49(4): 0405002
- Infrared and Laser Engineering
- Vol. 49, Issue 4, 0405002 (2020)
Fig. 1. Absorption line of CH4 molecule at 1 492.5 - 1 694.5 nm
Fig. 2. Experimental configuration
Fig. 3. 2f signals’ amplitude of 10 different concentrations of CH4
Fig. 4. Fitting curve of the 2f signal's amplitude and the CH4 concentration
Fig. 5. 2f signal's amplitude (SA) at a CH4 concentration of 250 ppmv
Fig. 6. Noise fluctuation signal (NA) when CH4 concentration is 0 ppmv
Fig. 7. 10 hours of stability observation experimental data
Fig. 8. Allan deviation analysis of the detection system
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Table 1. Test results with N2 as background
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