Tao Wu, Huailin Zhang, Weiping Kong, Xingdao He, Zhongping Chen, Weidong Chen. Simultaneous On-Line Measurement of Exhaled Carbon Dioxide and Water Vapor Based on 2.73 μm Distributed Feedback Laser[J]. Acta Optica Sinica, 2018, 38(12): 1230001
- Acta Optica Sinica
- Vol. 38, Issue 12, 1230001 (2018)
Fig. 1. Exhaled gas detection system based on DFB laser
Fig. 2. 2f signal simulation for CO2 and water vapor
Fig. 3. Variation of 2f signal peak height with modulation amplitude at different pressures
Fig. 4. Variations of 2f signal peak height with (a) modulation phase and (b) modulation frequency
Fig. 5. Relation between 2f signal peak height and volume fraction of CO2
Fig. 6. (a) Fitted relation between 2f signal peak height and volume fraction of CO2; (b) partial enlarged detail
Fig. 7. (a) Relation between 2f signal peak height and volume fraction of water vapor; (b) partial enlarged detail
Fig. 8. 2f signals of exhaled CO2 and water vapor obtained by experimental measurement
Fig. 9. Variations of volume fraction of CO2 during respiration of two volunteers. (a) The first volunteer; (b) the second volunteer
Fig. 10. Variation of volume fraction of water vapor during respiration of the first volunteer
Fig. 11. (a) Distribution of CO2volume fraction deviation with measurement time; (b) frequency distribution histogram of CO2 volume fraction deviation and Gaussian lineshape fitting
Fig. 12. Allan variance of measurement system
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