Continuous Detection of Diurnal Sodium Fluorescent Lidar over Beijing in China
Abstract
:1. Introduction
2. Diurnal Sodium Fluorescence Lidar System
3. Research and Improvement on Key Techniques of Daytime Detection
3.1. Daytime Detection Lidar Technology and Working Principle of FADOF
3.2. Improved Optical Path Technology for Daytime Detection of Atomic Filters
3.3. Research and Improvement of Other Key Technologies
4. Analysis of Daytime Observations
4.1. Statistics of Continuous Observation Duration
4.2. Detection Results
4.3. Sporadic Sodium Layer During the Daytime
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Laser Emission System | Nd:YAG Laser | Na Channel |
Wavelength | 532 nm | 589.158 nm |
Pulse energy | 230 mJ | 46 mJ |
Repetition rate | 30 Hz | 30 Hz |
Pulse width | 10 ns | 10 ns |
Beam divergence | <0.5 mrad | <0.5 mrad |
Linewidth | --- | 1.5 GHz |
Signal Receiving System | ||
Telescope aperture | 1 m | |
Focal length | 2 m | |
Fiber diameter | 1.5 mm | |
Signal Detection System | ||
Optical filter FWHM | 1.0 ± 0.2 nm | |
Out-of-band suppression | OD8 (200–1200 nm) | |
Peak transmittance | >75% | |
Quantum efficiency of PMT | <40% | |
Atomic filter transmittance | >80% | |
Operating temperature of atomic filter | >160 °C | |
Atomic filter single peak half linewidth | 0.6 GHz | |
Data Acquisition and Timing Control System | ||
Count rate | 150 MHz | |
Bin width | 640 ns | |
Bin number | 2048 |
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Du, L.; Wang, J.; Yang, Y.; Xun, Y.; Li, F.; Wu, F.; Gong, S.; Zheng, H.; Cheng, X.; Yang, G.; et al. Continuous Detection of Diurnal Sodium Fluorescent Lidar over Beijing in China. Atmosphere 2020, 11, 118. https://doi.org/10.3390/atmos11010118
Du L, Wang J, Yang Y, Xun Y, Li F, Wu F, Gong S, Zheng H, Cheng X, Yang G, et al. Continuous Detection of Diurnal Sodium Fluorescent Lidar over Beijing in China. Atmosphere. 2020; 11(1):118. https://doi.org/10.3390/atmos11010118
Chicago/Turabian StyleDu, Lifang, Jihong Wang, Yong Yang, Yuchang Xun, Faquan Li, Fuju Wu, Shunsheng Gong, Haoran Zheng, Xuewu Cheng, Guotao Yang, and et al. 2020. "Continuous Detection of Diurnal Sodium Fluorescent Lidar over Beijing in China" Atmosphere 11, no. 1: 118. https://doi.org/10.3390/atmos11010118
APA StyleDu, L., Wang, J., Yang, Y., Xun, Y., Li, F., Wu, F., Gong, S., Zheng, H., Cheng, X., Yang, G., & Lu, Z. (2020). Continuous Detection of Diurnal Sodium Fluorescent Lidar over Beijing in China. Atmosphere, 11(1), 118. https://doi.org/10.3390/atmos11010118