Study on hemisphere space laser scattering and polarization characteristics of asphalt pavement

Tao Yang; Jiancheng Lai; Zhenhua Li

doi:10.1117/12.2686797

6 August 2023 Study on hemisphere space laser scattering and polarization characteristics of asphalt pavement

Tao Yang, Jiancheng Lai, Zhenhua Li

Proceedings Volume 12781, International Conference on Optoelectronic Information and Functional Materials (OIFM 2023); 127811G (2023) https://doi.org/10.1117/12.2686797
Event: 2023 International Conference on Optoelectronic Information and Functional Materials (OIFM 2023), 2023, Guangzhou, JS, China

Abstract

The scattering characteristics of the pavement are the key factors affecting the performance of optical sensors used for the road detection such as LiDAR. Limited by the wavelength of the laser and the roughness of the pavement, the solution of the laser scattering on the asphalt pavements is outside the applicable range of the common analytical approximation models of electromagnetic scattering. Moreover, conventional numerical methods such as the method of moments have problems in computational memory and efficiency for two-dimensional rough surfaces, and these methods cannot deal well with the case of shielding and multiple scattering when the laser is incident at a large angle on a strong rough surface. In order to solve this problem, we propose a 3D hemisphere space scattering model based on ray tracing to describe the scattering and depolarization characteristics of the asphalt pavement. Compared with the 2D plane scattering model, the advantage of the 3D model is that it can solve the polarization information of the scattered lights. The results of the calculation show that the scattering intensity and the depolarization ratio of the asphalt pavement are both related to the roughness of the pavement closely. In general, with the increase of the roughness of the pavement, the backscattering intensity becomes stronger, and the depolarization ratio becomes larger.

Citation Download Citation

Tao Yang, Jiancheng Lai, and Zhenhua Li "Study on hemisphere space laser scattering and polarization characteristics of asphalt pavement", Proc. SPIE 12781, International Conference on Optoelectronic Information and Functional Materials (OIFM 2023), 127811G (6 August 2023); https://doi.org/10.1117/12.2686797

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KEYWORDS

Asphalt pavements

Laser scattering

Polarization

Backscatter

Depolarization

Scattered light

Reflection

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