Yafei Li, Zhiwei Liu, Tianyu Zhang, Chuantao Zheng, Yiding Wang. Development and Application of Near-Infrared Laser Carbon Dioxide Gas Sensor System[J]. Acta Optica Sinica, 2020, 40(5): 0514003
- Acta Optica Sinica
- Vol. 40, Issue 5, 0514003 (2020)
Fig. 1. Schematic of near-infrared CO2 sensor system
Fig. 2. Selection of CO2 absorption line. (a) Absorption spectra of CO2; (b) absorbance of CO2 and H2O, and driver current as a function of laser emission wavenumber at operation temperature of 28 ℃
Fig. 3. Relationship between modulation depth and amplitude of second harmonic signal at CO2 volume fraction of 2×10-3
Fig. 4. Relationship between amplitude of second harmonic signal and measurement time for different CO2 concentration
Fig. 5. Fitting curve between volume fraction of gas and amplitude of second harmonic signal
Fig. 6. Retrieved result versus time when volume fraction of CO2 is 0
Fig. 7. Allan deviation curve of near-infrared CO2 sensor
Fig. 8. Measured response time curve of sensor
Fig. 9. Observed CO2 concentration in laboratory environment
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Table 1. Performances of three near-infrared CO2 sensors
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