Xuejie Gao, Jiqiao Liu, Chuncan Fan, Cheng Chen, Juxin Yang, Shiguang Li, Yuan Xie, Xiaopeng Zhu, Weibiao Chen. Carbon Dioxide Column Concentration Measurement Based on Cloud Echo Signal of 1.57 μ m IPDA Lidar[J]. Chinese Journal of Lasers, 2023, 50(23): 2310001
- Chinese Journal of Lasers
- Vol. 50, Issue 23, 2310001 (2023)
Fig. 1. Schematic diagram of airborne IPDA lidar detection
Fig. 2. Schematic of IPDA lidar system
Fig. 3. Schematic diagram of IPDA lidar transceiver system
Fig. 4. Images of clouds taken by onboard camera. From left to right, it is seen that cloud cover increases successively and clouds become thicker
Fig. 5. Data processing flow chart
Fig. 6. Schematic diagram of target altitude calibration with airborne lidar
Fig. 7. Signals received by IPDA lidar. (a) Aliasing cloud echo signal; (b) two-layer cloud echo signal; (c) single-layer cloud echo signal; (d) ground echo signal; (e) cloud and ground echo signals
Fig. 8. Schematic diagram of cloud signal extraction method. (a) Diagrams of echo signal extraction; (b) diagrams of extracted signal with same integral range
Fig. 9. Voltage values of backscatter profile varying with height. (a) Echo signal after altitude correction; (b) comparison of first echo signal before and after altitude correction; (c) comparison of second echo signal before and after altitude correction
Fig. 10. Summary plot of IPDA lidar measurements on 2019-03-14
Fig. 11. Trends of monitor signal energy and echo signal energy of cloud signal. (a) Online monitor signal; (b) offline monitor signal; (c) online echo signal; (d) offline echo signal
Fig. 12. Diagram of relative reflectance of clouds
Fig. 13. Diagram of cloud density distribution
Fig. 14. Images of cloud cover change captured by onboard camera
Fig. 15. Comparison between trend of CO2 column concentration on cloud measured by IPDA lidar and trend of single-point CO2 concentration measured by in-situ measuring instrument
Fig. 16. Schematic diagram of CO2 column concentrations on clouds
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Table 1. Main system parameters of airborne 1.57 μm double-pulse IPDA lidar
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