Chenglong ZHAO, Danfei HUANG, Zhiying LIU, Yuqi WANG, Aiqi ZHONG, Qinming ZHANG, Fanhong MENG. Measurement of Trace CO2 Concentration with Open-path TDLAS-WMS Technology[J]. Acta Photonica Sinica, 2022, 51(2): 0230001
- Acta Photonica Sinica
- Vol. 51, Issue 2, 0230001 (2022)
Fig. 1. Gas absorption lines
Fig. 2. Primary harmonic spectrum diagram
Fig. 3. Secondary harmonic spectrum diagram
Fig. 4. The absorption lines of CO2、O2、H2O、CH4 molecules in the range of 1 333.33~2 222.22 nm
Fig. 5. Test system block diagram
Fig. 6. Test system block diagram
Fig. 7. Gas absorption pool simulation diagram
Fig. 8. Gas absorption pool simulation ray trace diagram
Fig. 9. Physical picture of gas absorption tank
Fig. 10. CO2 0 ppmv and 300 ppmv waveforms
Fig. 11. Successive measurements within 30 min
Fig. 12. Waveform processing images of 11 groups of CO2 with different concentrations
Fig. 13. The relationship between the peak-peak value and concentration of the second harmonic wave
Fig. 14. Allan variance analysis of the detection system
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