scholarly journals Study of the Terahertz Wave Scattering From Metal Surface Coated by Rough Lossy Coating Based on a Ray Tracing Modeling

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 116799-116808 ◽  
Author(s):  
Rui Wang ◽  
Guangbin Guo ◽  
Lixin Guo
Keyword(s):  
Ray Tracing ◽  
Metal Surface ◽  
Wave Scattering ◽  
Terahertz Wave

scholarly journals Millimeter and terahertz wave scattering diagrams in rains

2015 ◽  
Vol 20 (1) ◽  
pp. 26-31
Author(s):  
V. Kostina ◽  
◽  
Yu. Malyshenko ◽  
A. Roenko
Keyword(s):  
Wave Scattering ◽  
Terahertz Wave

Non-destructive Evaluation of a Corroded Metal Surface Using Terahertz Wave

2013 ◽  
Vol 50 (50) ◽  
pp. 81-88 ◽  
Author(s):  
H. Kariya ◽  
A. Sato ◽  
T. Tanabe ◽  
K. Saito ◽  
K. Nishihara ◽  
...  
Keyword(s):  
Metal Surface ◽  
Terahertz Wave ◽  
Non Destructive Evaluation ◽  
Non Destructive

scholarly journals Broadband diffuse terahertz wave scattering by flexible metasurface with randomized phase distribution

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Yin Zhang ◽  
Lanju Liang ◽  
Jing Yang ◽  
Yijun Feng ◽  
Bo Zhu ◽  
...  
Keyword(s):  
Wave Scattering ◽  
Phase Distribution ◽  
Terahertz Wave

Gloss Evaluation of Hairline-Finished Metal Surface Using Patterned Area Illumination Method: Reproduction of Gloss Evaluation by Ray Tracing

2015 ◽  
Vol 656-657 ◽  
pp. 468-472 ◽  
Author(s):  
Tadanori Sugino ◽  
Yasuo Yamane
Keyword(s):  
Surface Roughness ◽  
Ray Tracing ◽  
Metal Surface ◽  
Surface Finish ◽  
Quality Evaluation ◽  
Specular Reflection ◽  
Angle Of Incidence ◽  
Striped Pattern ◽  
Illumination Method ◽  
Angle Of Reflection

Gloss of a metal surface is an important aspect for product quality evaluation. Evaluating the specular reflection is almost the same as evaluating the gloss. We propose a method that uses patterned area illumination to evaluate specular reflection. In specular reflection, the angle of incidence equals the angle of reflection. Consequently, when light (ray) of the area illumination, which has a striped pattern, are projected on a glossy metal surface, a striped pattern forms on the reflected image as a mirror-like reflection, and the sharpness of the striped pattern of the image provides information about the specular reflection on the surface. This characteristic is applied to a metal with a hairline surface finish. A hairline surface presents different glossiness at different viewpoints. When the direction of the striped pattern of illumination is changed, the sharpness of striped pattern on the reflected image varies owing to the surface roughness of the hairline finish. Therefore, we can evaluate the glossiness in various directions by rotating the pattern. The relationships between gloss evaluation value and surface roughness were indicated in our study. We tried the reproduction of the gloss evaluation by ray tracing to obtain the more detailed relationships between them. Ray tracing is a technique to generate an image in computer graphics. The approximate reproduction of gloss evaluation was obtained by the simulation.

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