Study on Difference Field Scattering Properties between Slightly Rough Optical Surface and above Redundant Particles

Lei, 巩蕾 Gong; Zhensen, 吴振森 Wu; Shaoyu, 代少玉 Dai; Zhengjun, 李正军 Li

doi:10.3788/aos201535.0829001

Cited by 2 publications

(1 citation statement)

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“…Only when the illumination width of incident wave is small, can the scattering contribution of the defect particles be valid. [30] In order to eliminate these uncertainties of the numerical results, the research on difference scattering field has been conducted. Johnson [31] first proposed the concept of the difference scattering field which calculates the scattering fields of a rough surface with and without the targets, and uses the difference between these two scattering fields to obtain the difference radar cross section (RCS).…”

Section: Introductionmentioning

confidence: 99%

Difference scattering field properties between periodic defect particles and three-dimensional slightly rough optical surface

Chen¹,

Wu²,

Bai³

et al. 2017

Chinese Phys. B

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Based on the practical situation of nondestructive examination, the calculation model of the composite scattering is established by using a three-dimensional half-space finite difference time domain, and the Monte Carlo method is used to solve the problem of the optical surface with roughness in the proposed scheme. Moreover, the defect particles are observed as periodic particles for a more complex situation. In order to obtain the scattering contribution of defects inside the optical surface, a difference radar cross section is added into the model to analyze the selected calculations on the effects of numbers, separation distances, different depths and different materials of defects. The effects of different incident angles are also discussed. The numerical results are analyzed in detail to demonstrate the best position to find the defects in the optical surface by detecting in steps of a fixed degree for the incident angle.

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Section: Introductionmentioning

confidence: 99%