Infrared and Laser Engineering, Volume. 54, Issue 7, 20250044(2025)
Research on FMCW lidar echo polarization characteristics
Figures & Tables(18)
Fig. 5. Curves showing the change of incident angle and polarization degree for different detection targets
Fig. 6. Schematic diagram of the effect of atmospheric turbulence on light waves
Fig. 7. Schematic diagram of FMCW detection based on polarization orthogonal demodulation
Fig. 8. The heterodyne efficiency varies with the angle of the waveplate and the phase difference
Fig. 9. Curve of heterodyne efficiency changing with wave plate angle
Fig. 10. Variation of signal-to-noise ratio and detection distance at different wave plate angles
Fig. 11. Relationship between signal-to-noise ratio and wave plate angle at different detection distances
Fig. 12. Relationship between signal-to-noise ratio and wave plate angle under different lighting conditions
Fig. 13. The detection targets are (a) reflector, (b) green luo, (c) bird feather, (d) quadcopter UAV, (e) marble, (f) plastic bag
Fig. 14. (a) Distance distribution and side mode suppression ratio when the wave plate angle is 22.5°; (b) Distance distribution and side mode suppression ratio when the wave plate angle is 45°; (c) Distance distribution and side mode suppression ratio when the wave plate angle is 60°
Table 1. Some key parameters of the system
View tableView in ArticleTable 1. Some key parameters of the system
Parameter Numerical value Laser center wavelength/nm 1550 Laser modulation period/μs 40 Modulation bandwidth/GHz 5 Laser linewidth/kHz 160 Response bandwidth/MHz 150 Responsivity/A·W−1 1
Table 2. Target distance measurement by different detection systems
View tableView in ArticleTable 2. Target distance measurement by different detection systems
Target type Reflecting mirror Quadcopter UAV Bird feathers Detection system Typical Polarization Typical Polarization Typical Polarization Distance measurement standard deviation/m 0.026 0.018 0.027 0.020 0.034 0.027 Side Mode Suppression Ratio/dB −23.099 −25.836 −21.898 −24.521 −19.783 −22.446 Target type Green luo Marble Plastic bag Detection system Typical Polarization Typical Polarization Typical Polarization Distance measurement standard deviation/m 0.037 0.028 0.038 0.030 0.041 0.032 Side Mode Suppression Ratio/dB −15.968 −18.426 −12.088 −14.157 −9.588 −11.342
Table 3. Distance measurement of targets with different surface roughness using different detection systems
View tableView in ArticleTable 3. Distance measurement of targets with different surface roughness using different detection systems
Target type Reflecting mirror Green luo Bird feathers Detection system Typical Polarization Typical Polarization Typical Polarization Distance measurement standard deviation/m 0.025 0.017 0.029 0.018 0.032 0.027 Side Mode Suppression Ratio/dB −12.359 −18.481 −10.117 −15.986 −8.019 −12.759 Target type Marble Quadcopter UAV Plastic bag Detection system Typical Polarization Typical Polarization Typical Polarization Distance measurement standard deviation/m 0.036 0.029 0.038 0.031 0.041 0.034 Side Mode Suppression Ratio/dB −4.646 −8.365 −2.917 −4.600 −1.465 −3.359
Table 4. Influence of wave plate angle on distance measurement of polarization detection system
View tableView in ArticleTable 4. Influence of wave plate angle on distance measurement of polarization detection system
Polarization detection system Target type Reflecting mirror Waveplate angle/(°) 22.5 45 60 Distance measurement standard deviation/m 0.036 0.012 0.028 Side mode suppression ratio/dB −9.459 −16.931 −14.759
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Yu LIU, Chenghao JIANG, Ye YUAN, Tianpeng XIE, Buyun PING, Jingguo ZHU. Research on FMCW lidar echo polarization characteristics[J]. Infrared and Laser Engineering, 2025, 54(7): 20250044
Paper Information
Category: Laser
Received: Jan. 3, 2025
Accepted: --
Published Online: Aug. 29, 2025
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