Dr. Jiang Xu Profile

Dr. Jiang Xu

at Nanjing Univ of Science and Technology

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Proceedings Article | 7 September 2018 Presentation + Paper

Research on active polarization-based target detection on sea surface

Dongming Lu, Guohua Gu, Jiang Xu, Lixiang Geng

Proceedings Volume 10751, 107510J (2018) https://doi.org/10.1117/12.2320587

KEYWORDS: Coating, Scattering, Polarization, Target detection, Reflection, CCD cameras

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Since the polarization image contains abundant information of the object, the detecting ability of imaging system would be improved via observing the polarization features of this object. On the basis of analysis to the polarization characteristics, the active polarized imaging method is introduced in this paper, and active polarized imaging platform is built. Through this system, 3 typical samples of aluminum, iron with yellow coating, iron with green coating are adopted to simulate different objects on the sea. By measuring the parameters of amplitude ratio P, phase retardation θ, and completely depolarized coefficient ω_d on the platform, which stand for the surface property of the material, we can testify the accuracy of the idea. The experiments result shows that the measured P and θ values are consistent with Fresnel equations, while for ω_d , the value of seawater differs from that of the other two coating samples dramatically. As a result, it is feasible to discriminate coating target on the sea by measuring the depolarization characteristics.

Proceedings Article | 27 September 2016 Paper

Mueller-Jones Matrix measurement in material identification

Jiang Xu, Weixian Qian, Xiao Wang

Proceedings Volume 9953, 99530I (2016) https://doi.org/10.1117/12.2235889

KEYWORDS: Scattering, Polarization, Statistical analysis, System identification, Electromagnetic scattering, Statistical modeling, Soil science, Nonmetals, Surface roughness, Reflection

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The uniformity of lattice arrangement plays an important role in industrial processing, science and technology studies and environmental pollution detection. However, there are very little papers to study surface structure by depolarization characteristics. In order to improve the efficiency and accuracy of material identification system by polarization technology, we developed a new method to decompose the Mueller matrix, we studied the mechanism of the scattering of electromagnetic wave, and analyzed the relationship between the characteristics of depolarization and mechanism of scattering. We used the Jones Matrix and Mueller Matrix to set up the physical model, and decomposed the Mueller-Jones Matrix by the characteristics of polarization, then got the depolarization coefficients (ωd) of the surfaces of the samples. By using this theory, we deduced the relation formula of Mueller matrix, Mueller-Jones matrix and Isotropic-Depolarizer matrix. Based on the polarized characteristics of the samples, we analyzed design method of material identification system and gave the results of the experimental test. Finally, we applied the theory of Fresnel formulas to verify the theoretical model. From the results, we found that the depolarization coefficients of the samples’ surfaces were related to the scattering, and in the whole measurement process, the depolarization coefficients of the samples were far different; the method could easily to distinguish the metal and nonmetal, and more quickly to analyze the surface roughness of the samples. Therefore, the depolarization technology had a great application value, and the paper had very important significance on the development of surface structure study.

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