Infrared and Laser Engineering, Volume. 52, Issue 7, 20220762(2023)
Multi-longitudinal-mode Mie scattering Doppler lidar technology based on dual Fabry-Perot interferometer
Figures & Tables(10)
Fig. 1. Atmospheric wind speed detection principle based on dual FPI and MLM laser. (a) Relative frequency range −14-+14 GHz; (b) Relative frequency range −5.25-+5.25 GHz
Fig. 2. Optical path of Doppler lidar receiving system based on dual FPI and MLM laser
Fig. 3. Mie-signal transmittance and Rayleigh-signal transmittance of dual FPI
Fig. 4. Transmittance curves of emitted laser incident on dual FPI with different matching errors
Fig. 5. Curve of FPI transmittance peak changing with matching error
Fig. 6. Contour map of the percentage of increase in wind speed error with the matching error and radial wind speed for different backscatter ratios
Fig. 7. Structure diagram of MLM Mie Doppler lidar based on dual FPI
Fig. 8. Profile of simulated atmospheric parameters with altitude. (a) Backscatter coefficients of atmospheric molecules and aerosols; (b) Backscatter ratio
Fig. 9. Simulation profile of parameter measurement error changing with altitude. (a) Wind speed; (b) Backscatter ratio
Table 1. Parameters of MLM Doppler lidar system based on dual FPI
View tableView in ArticleTable 1. Parameters of MLM Doppler lidar system based on dual FPI
Parameter Value Parameter Value Wavelength 1064 nm Laser energy/pulse 550 mJ Laser mode number 9 Laser mode interval 3.5 GHz Laser mode linewidth 60 MHz Laser repetition frequency 50 Hz Beam diameter 7 mm Pulse width 7-9 ns Beam divergence 0.5 mrad Beam expander ×8 Telescope/scanner aperture 25 cm Telescope focal length 625 mm Scan range 360°×90° Field of view 0.1 mrad Optical efficiency >85% Zenith angle 30° FPI free spectral range 3.5 GHz FPI-1 and FPI-2 separation 0.2 GHz FWHM of FPI-1, FPI-2 0.2 GHz Defect finesse of FPI 71 Effective reflectivity of FPI 0.836 Loss coefficient of FPI 0.2% Actual reflectivity of FPI 0.841 Dual FPI aperture 60 mm Fiber core diameter 62.5 μm Fiber NA 0.22 Solar filter bandwidth 0.5 nm APD quantum efficiency 18% @1064 Filter peak transmission >60% Detector dark count 100 counts/s BS-1, BS-2 splitting ratio (R/T) 20/80 , 50/50 Multiscaler sampling rate 200 MHz
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Fahua Shen, Jingyuan Xu, Andong Fan, Chenbo Xie, Bangxin Wang, Liangliang Yang, Hui Zhou, Hua Xu. Multi-longitudinal-mode Mie scattering Doppler lidar technology based on dual Fabry-Perot interferometer[J]. Infrared and Laser Engineering, 2023, 52(7): 20220762
Paper Information
Category: Lasers & Laser optics
Received: Oct. 27, 2022
Accepted: --
Published Online: Aug. 16, 2023
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