Zijian YANG, Lin LI, Guqing GUO, Ting GONG, Qiang LIU, Yali TIAN, Xiaocong SUN, Xuanbing QIU, Chuanliang LI. Trace carbon dioxide gas sensor based on resonance photoacoustic spectroscopy[J]. Journal of Atmospheric and Environmental Optics, 2025, 20(2): 168

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- Journal of Atmospheric and Environmental Optics
- Vol. 20, Issue 2, 168 (2025)

Fig. 1. Schematic diagram of photoacoustic spectrum sensor system

Fig. 2. Software simulated beam results (a) and the spot distribution of 640 nm laser in the mirror (b)

Fig. 3. Relationship between photoacoustic signal intensity and experimental conditions. (a) Modulation frequency ; (b) pressure; (c) gas flow; (d) modulation amplitude

Fig. 4. 2f signal of 42 times reflection (red line) and 2f signal of single reflection (black line) (a) and the relationship between photoacoustic signal and CO2 mass concentration (b), the red straight line represents linear fitting

Fig. 5. 2f signal at 196.42 mg/m-3 CO2 standard gas (a) and long term monitoring of gas mass concentration in the photoacoustic cavity of 500 mg/m-3 CO2 standard gas (b), the illustration is the amplification of 1 h signal

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