Predicting reflections of thin coatings

Goossens, V.; Gotzen, Nicolaas-Alexander; Gils, Sake Van; Stijns, Erik; Assche, Guy Van; Finsy, Robert; Terryn, Herman

doi:10.1016/j.surfcoat.2009.07.047

Cited by 11 publications

(11 citation statements)

References 32 publications

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“…Previous studies [28,29] have confirmed that perfectly smooth surfaces allow specular (mirror-like) reflection which obeys law of reflection; that is, the angle of incident beam is equal to the angle of reflected beam, whereas rough surfaces cause diffuse reflection as the incident beams are reflected in various directions. When the surface roughness increases, reflected light becomes more diffusive so the surface looks matt or dull.…”

Section: Reflectionmentioning

confidence: 91%

Identifying Key Factors towards Highly Reflective Silver Coatings

Zheng

Wong²,

et al. 2017

Advances in Materials Science and Engineering

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This paper attempts to identify key factor(s) for highly reflective silver (Ag) coatings. Investigation was made over the crystal orientation and surface roughness, using several types of surfaces, including electroplated Ag polycrystal films, physical vapour deposited polycrystal Ag films, and single crystal Ag foils with different crystal orientations. In each type of the surfaces, surface roughness was varied so that, for different combinations of crystal orientation, roughness would elucidate the key factors towards highly reflective Ag coatings. It is found that surface roughness plays a critical role in determining the reflectance, while the crystal orientation has negligible effect. The mean reflectance and one-way ANOVA analysis indicate that the single crystal Ag foils with three orientations performed statistically the same in the same roughness group at significance level = 0.05. Moreover, correlation between the surface reflectance and surface roughness has been proposed for the benefit of coating design. Refection data obtained from the polycrystalline silver samples are used to verify the accuracy of the proposed correlations. It was observed that the development surface area ratio, , is a better roughness indicator in predicting the reflectance of polycrystalline silver films than the arithmetic average roughness, .

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Section: Reflectionmentioning

confidence: 91%

Identifying Key Factors towards Highly Reflective Silver Coatings

Zheng

Wong²,

et al. 2017

Advances in Materials Science and Engineering

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“…In the case of polished metals, the Cook-Torrance model did not perform well, thus invention and implementation of a more plausible model would be valuable. A good candidate for polished metals could be the Beckmann model [11].…”

Section: Resultsmentioning

confidence: 99%

“…The above examples show that the CookTorrance model is not suitable for the simulation of gloss in the case of polished metals. Authors in [11] simulated surface roughness of polished steel using the Beckmann formula. Their gloss measurement simulation shows that for a smooth polished surface this worked well, although for a rougher surface, opposite to our model, their model becomes inadequate.…”

Section: Virtual Measurementsmentioning

confidence: 99%

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Virtual gonio-spectrophotometer for validation of BRDF designs

Mihálik¹,

Ďurikovič²

2011

Open Physics

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Abstract:Measurement of the appearance of an object consists of a group of measurements to characterize the color and surface finish of the object. This group of measurements involves the spectral energy distribution of propagated light measured in terms of reflectance and transmittance, and the spatial energy distribution of that light measured in terms of the bidirectional reflectance distribution function (BRDF). In this article we present the virtual gonio-spectrophotometer, a device that measures flux (power) as a function of illumination and observation. Virtual gonio-spectrophotometer measurements allow the determination of the scattering profile of specimens that can be used to verify the physical characteristics of the computer model used to simulate the scattering profile. Among the characteristics that we verify is the energy conservation of the computer model. A virtual gonio-spectrophotometer is utilized to find the correspondence between industrial measurements obtained from gloss meters and the parameters of a computer reflectance model.

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“…Especially for a mirror finished surface, the specular spike is dominant and almost all the reflected power is within the half opening angle of 0.1 • [23,24]. In Ref.…”

Section: Variation Of First Mirror Reflectancementioning

confidence: 99%

Ray Trace Study for Visible Spectroscopy Reference System (VSRS) Diagnostics in ITER

Kajita

Bock²,

Desjardins³

et al. 2019

Plasma and Fusion Research

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The visible spectroscopy reference system (VSRS) diagnostic will be used to measure the continuum visible light emitted from the plasma in ITER. Because the field of view of the VSRS system is aligned to a hole on a blanket module with a retroreflector on the bottom, which will be shared with an interferometer measurement, it has a potential to be free from the stray light, which may disturb signals for optical diagnostics in ITER. In this study, performance of the stray light reduction in the VSRS is investigated using a ray tracing simulation. We investigated the influences of the reflection property of the retroreflector and first mirror for the signal and stray light intensity.

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Predicting reflections of thin coatings

Cited by 11 publications

References 32 publications

Identifying Key Factors towards Highly Reflective Silver Coatings

Identifying Key Factors towards Highly Reflective Silver Coatings

Virtual gonio-spectrophotometer for validation of BRDF designs

Ray Trace Study for Visible Spectroscopy Reference System (VSRS) Diagnostics in ITER

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