Double-pulse 1.57 μm integrated path differential absorption lidar ground validation for atmospheric carbon dioxide measurement
| Autor: | Huaguo Zang, Xiuhua Ma, Weibiao Chen, Junxuan Zhang, Dan Liu, Xiaolei Zhu, Juan Du, Shiguang Li, Yadan Zhu, Jiqiao Liu, Yanguang Sun, Decang Bi |
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| Rok vydání: | 2017 |
| Předmět: |
Carbon dioxide in Earth's atmosphere
Materials science Offset (computer science) 010504 meteorology & atmospheric sciences Scattering business.industry Ranging 01 natural sciences Atomic and Molecular Physics and Optics 010309 optics Optics Fiber laser 0103 physical sciences Path (graph theory) Measurement uncertainty Electrical and Electronic Engineering business Engineering (miscellaneous) Optical depth 0105 earth and related environmental sciences |
| Zdroj: | Applied optics. 56(25) |
| ISSN: | 1539-4522 |
| Popis: | A ground-based double-pulse integrated path differential absorption (IPDA) instrument for carbon dioxide (CO2) concentration measurements at 1572 nm has been developed. A ground experiment was implemented under different conditions with a known wall located about 1.17 km away acting as the scattering hard target. Off-/offline testing of a laser transmitter was conducted to estimate the instrument systematic and random errors. Results showed a differential absorption optical depth (DAOD) offset of 0.0046 existing in the instrument. On-/offline testing was done to achieve the actual DAOD resulting from the CO2 absorption. With 18 s pulses average, it demonstrated that a CO2 concentration measurement of 432.71±2.42 ppm with 0.56% uncertainty was achieved. The IPDA ranging led to a measurement uncertainty of 1.5 m. |
| Databáze: | OpenAIRE |
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