Gloss and Surface Topography

Whitehouse, David; Bowen, D. K.; Venkatesh, V.C.; Lonardo, P.M.; Brown, Christopher

doi:10.1016/s0007-8506(07)60500-9

Cited by 45 publications

(22 citation statements)

References 10 publications

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“…The r value is relevant for the gloss of the metal, varying between 0.33 and 0.94 for iron and silver, respectively, for a mid visual light frequency [237]. The extinction index establishes the decay law of the light intensity through the metal:…”

Section: Optical Propertiesmentioning

confidence: 99%

Advances in engineered surfaces for functional performance

Bruzzone¹,

Costa²,

Lonardo³

et al. 2008

CIRP Annals

615

247

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Section: Optical Propertiesmentioning

confidence: 99%

Advances in engineered surfaces for functional performance

Bruzzone¹,

Costa²,

Lonardo³

et al. 2008

CIRP Annals

615

247

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“…Previous studies on surface roughness and resulting brightness of surfaces show, inter alia, a trend towards a logarithmic dependence of the brightness of a non-metallic surface of a silicon wafer in dependence on the measured roughness [17]. Okada shows in his work that gloss (medium gloss, 60°) can be enhanced by the smoothing of a metallic surface and tried to correlate this result with the measured roughness Rz [18].…”

Section: Gloss Measurementmentioning

confidence: 97%

Design surfaces by laser remelting

Temmler

Willenborg

Wissenbach

2015

Materialwissenschaft Werkst

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Molds and dies are used today in the manufacturing of a wide range of industrial products. They have a broad field of applications from the air and space technology, the automotive sector, to electrical engineering, to household products and consumer goods. The surface of a part or product strongly influences its properties and functions e.g. it's visual appearance. The gloss thereby reflects one of the most important properties of a surface when it comes to evaluate the visual appearance. Therefore, among others, in this paper the influence of laser polishing on the generated specular gloss is investigated for the hot work steel 1.2343 (AISI: H11). On the one hand laser polished surfaces are measured by WLI and investigated by a spectral analysis of surfaces roughness. A spectral analysis is achieved by a discrete convolution of the surface profile with a Gaussian loaded function similar to ISO 11562. On the other hand specular gloss measurements were carried out at 20°, 60° and 85°. For the experiments a fiber‐coupled solid state disc laser (Yb : YAG; Q‐switched) is used (PL,max = 550 W; repetition frequency: fP = 5–20 kHz, pulse duration: tP = 0,7–3,5 µs, pulsed and cw‐operation). In general, scanning velocity and average laser power are two crucial procedural parameters for laser polishing with significant influence on the resulting surface roughness. These procedural parameters are investigated systematically, while other procedural parameters, such as laser beam diameter dL = 250 µm and track offset dy = 25 µm were kept constant. By this a significant reduction of roughness was achieved, especially for the wavelength interval λ < 320 µm. A correlation between specular gloss of surfaces and the measured micro‐roughness is carried out. In order to make a systematic classification laser polished fields are compared to surfaces which were prepared by conventional mechanical manufacturing processes, such as turning, milling, grinding, high end manual polishing etc. Specular gloss shows a good exponential correlation with micro‐ and meso‐roughness were as macro roughness shows no significant influence on the specular gloss. Additionally, a complete process chain for selectively laser polishing of metallic surfaces was developed in order to apply different levels of gloss onto free formed work pieces. Selective laser polishing and the process chain are demonstrated for a free formed tool insert with leather textured surface, where only the indentations of the leather texture were laser polished selectively

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“…Gloss is a function of the directional reflectance properties of surfaces [5], but is also influenced by the subjective assessment of the observer [6,7]. There is a nonlinear relation between gloss perception and instrumental specular gloss values.…”

Section: Light Interaction With Surfacesmentioning

confidence: 99%

“…BRDF is the ratio of the reflected radiance (Lr, luminance) in the exiting direction to the irradiance (Ei, illuminance) in the direction of incident light (Equation 1 and Fig. 2, right) [4,7]. Radiance is the light energy at a point; irradiance defines how much light power reaches a certain area.…”

Section: Gloss Measurementmentioning

confidence: 99%