Acta Photonica Sinica, Volume. 53, Issue 12, 1229001(2024)
Scattering Characteristics of 905 nm Laser on Asphalt Pavement under Water Coverage
Figures & Tables(19)
Fig. 1. The principle of ray tracing on water covered asphalt pavement
Fig. 2. Flowchart for calculating the laser scattering distribution of asphalt pavement covered with water
Fig. 3. Generation results of two-dimensional Gaussian random rough surfaces
Fig. 4. Comparison of longitudinal profiles of Gaussian random rough surfaces with different σs
Fig. 5. Schematic diagram of laser scattering calculation parameters for rough asphalt pavement
Fig. 6. The influence of surface element quantity on the stability of simulation model calculation results
Fig. 7. Comparison of calculation results between GORT model and other common numerical scattering models
Fig. 8. Scattered light intensity distribution curves of asphalt surfaces at a small incident angle（30°）
Fig. 9. Scattered light intensity distribution curves of asphalt surfaces at a large incident angle（70°）
Fig. 10. Schematic diagram of laser scattering intensity measurement system for water-covered asphalt samples
Fig. 11. Comparison between the measured and theoretical values of the reflected light intensity distribution under the 0° incidence of the standard diffuse reflection target
Fig. 12. Measurement and simulation results at different polarized light and incidence angles
Fig. 13. Measurement and simulation results at different depths of covered water
Table 1. Parameters of the simulation calculation
View tableView in ArticleTable 1. Parameters of the simulation calculation
Parameter Value Wavelength/nm 905 Emitting distance/m 0.5 Divergence angle/mrad 20 Incident angle/（°） 30 Scattering angle/（°） -85~85 Receiving solid angle/sr 2.39×10-4 Receiving distance/m 1 Polarization state s-light
Table 2. Comparison of accuracy and efficiency between GORT model and other common numerical scattering methods
View tableView in ArticleTable 2. Comparison of accuracy and efficiency between GORT model and other common numerical scattering methods
Model name Model type RMSE/sr-1 Run time/s RT Numerical 1.85×10-4 6 560 MoM Numerical 1.71×10-4 9 504 FDTD Numerical 2.25×10-4 6 264 GORT Analytical+Numerical - 792
Table 3. Half-width of the intensity distribution curve at 30° angle of incidence under different parameters
View tableView in ArticleTable 3. Half-width of the intensity distribution curve at 30° angle of incidence under different parameters
State of incident light and asphalt sample σ=0.5 mm σ=1 mm σ=2 mm s-light，dry asphalt 51 94 151 p-light，dry asphalt 45 81 100 s-light，water-covered asphalt 63 102 128 p-light，water-covered asphalt 54 92 111
Table 4. Half-width of the intensity distribution curve at 70° angle of incidence under different parameters
View tableView in ArticleTable 4. Half-width of the intensity distribution curve at 70° angle of incidence under different parameters
State of incident light and asphalt sample σ=0.5 mm σ=1 mm σ=2 mm s-light，dry asphalt 37 61 114 p-light，dry asphalt 16 45 51 s-light，water-covered asphalt 51 73 126 p-light，water-covered asphalt 45 75 88
Table 5. System parameters of the experimental setup
View tableView in ArticleTable 5. System parameters of the experimental setup
Module Parameter Value Emitting system Wavelength/nm 905 Peak power/W 70 Pulse width/ns 25 Divergence angle/mrad 20 Receiving system Diameter of active area/mm 0.5 Breakdown voltage/V 240 Responsivity/（A·W-1） 0.6 Quantum efficiency/% 90
Table 6. Root mean square error values of the measurements and the theoretical values
View tableView in ArticleTable 6. Root mean square error values of the measurements and the theoretical values
Test number 1 2 3 4 5 6 RMSE/sr-1 0.713 0.679 0.734 0.663 0.691 0.649 Ratio to theoretical peak 1.30% 1.24% 1.34% 1.21% 1.26% 1.18%
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Tao YANG, Wei YAN, Huimin ZHANG, Zhixiang WU, Yunjing JI, Yan ZHAO, Jiancheng LAI, Chunyong WANG, Zhenhua LI. Scattering Characteristics of 905 nm Laser on Asphalt Pavement under Water Coverage[J]. Acta Photonica Sinica, 2024, 53(12): 1229001
Paper Information
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Received: Sep. 5, 2024
Accepted: Nov. 14, 2024
Published Online: Jan. 15, 2025
The Author Email: Yan ZHAO (zhaoyan7906@njust.edu.cn), Jiancheng LAI (laijiancheng@njust.edu.cn), Chunyong WANG (wangcyong@njust.edu.cn), Zhenhua LI (lizhenhua@njust.edu.cn)
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