Author Affiliations
1School of Mechanical and Precision Instrument Engineering, Xi′an University of Technology, Xi′an, Shaanxi 710048, China1School of Mechanical and Precision Instrument Engineering, Xian University of Technology, Xian, Shaanxi 710048, Chinashow less
Fig. 1. Schematic diagram of the dual-wavelength lidar
Fig. 2. Simulation of signal-to-noise ratio
Fig. 3. SNR of the actual detection. (a) During daytime detection; (b) during nighttime detection
Fig. 4. Detection extinction coefficient profile of aerosol on a fine day
Fig. 5. Detection ozone concentration profile on a fine day
Fig. 6. Detection results on a fine day. (a) Extinction profiles of aerosols without ozone; (b) Angstrom index; (c) absolute error of extinction coefficient at 266 nm; (d) absolute error of Angstrom index
Fig. 7. Detection extinction profiles of aerosols on a haze day
Fig. 8. Detection ozone concentration profile on a haze day
Fig. 9. Detection results on a haze day. (a) Extinction profiles of aerosols without ozone; (b) Angstrom index; (c) absolute error of extinction coefficient at 266 nm; (d) absolute error of Angstrom index
Fig. 10. Concentrations of ozone obtained by the Mie lidar compared with weather station
Fig. 11. THI of aerosol extinction coefficient from 20:00 CST to 03:00 CST. (a) Aerosol extinction coefficient at 266 nm without ozone absorption coefficient; (b) aerosol extinction coefficient at 355 nm without ozone absorption coefficient
Device | Parameter | Value |
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Laser | Type | Nd∶YAG | Wavelength /nm | 266/355 | Energy at 266 nm/mJ | 60 | Energy at 355 nm/mJ | 120 | Divergence angle /mrad | 0.5 | Beam splitter | Reflectivity at 266 nm | 0.5 | Transmittance at 355 nm | 0.5 | Telescope | Diameter /mm | 400 | Field of view /mrad | 1 | Detector | PMT: Hamamatsu R7056 |
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Table 1. Configuration of the dual-wavelength lidar system