New primary standard for specular gloss measurements / Maria E. Nadal in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 911 (12/2000)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 72, N° 911 (12/2000) . - p. 61-66 Titre : New primary standard for specular gloss measurements Type de document : texte imprimé Auteurs : Maria E. Nadal, Auteur ; E. Ambler Thompson, Auteur Année de publication : 2000 Article en page(s) : p. 61-66 Note générale : Bibliogr. Langues : Américain (ame) Tags : Revêtement  Peinture  Propriété  optique  Feuil  Brillant  Méthode  mesure  Normalisation Index. décimale : 667.9 Revêtements et enduits Résumé : A new primary specular gloss standard has been developed at the National Institute of Standards and Technology to overcome the disadvantages of black glass. This new standard is a high-purity BaK50 glass with good mechanicaldurability and homogeneity. In addition, the index of refraction nD = 1.5677 is close to the value specified for the theoretical standard, and the dispersion characteristics are similar to black glass. En ligne : http://www.google.fr/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CDEQFjAA&url= [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5585 [article]

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NIST reference goniophotometer for specular gloss measurements / Maria E. Nadal in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 917 (06/2001)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 73, N° 917 (06/2001) . - p. 73-80 Titre : NIST reference goniophotometer for specular gloss measurements Type de document : texte imprimé Auteurs : Maria E. Nadal, Auteur ; E. Ambler Thompson, Auteur Année de publication : 2001 Article en page(s) : p. 73-80 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau  revêtement  Peinture  Propriété  optique  Feuil  Brillant  Réflexion  spéculaire  Appareil  mesure  Goniophotomètre Index. décimale : 667.9 Revêtements et enduits Résumé : The measurement of specular gloss consists of comparing the luminous reflectance from a test specimen to that from a gloss standard, under the same geometric conditions. The reference goniophotometer described here was designed and characterized to comply with the geometric and spectral conditions specified in the international documentary standards for specular gloss measurements at the standard geometries of 20, 60, and 85°. In addition, this instrument measures the bi-directional luminous reflectance and transmittance for incident angles from 0 to 85°. The goniophotometer and the measurement procedures used to determine the specular gloss of nonmetallic are described in this paper, as well as the characterization of the instrument and uncertainty analysis. The minimum relative expanded uncertainty (k=2) for the reference goniophotometer is 0.3%. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5736 [article]

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Optical reflectance of metallic coatings : effect of aluminium flake orientation / Li-Piin Sung in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 932 (09/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 932 (09/2002) . - p. 55-63 Titre : Optical reflectance of metallic coatings : effect of aluminium flake orientation Type de document : texte imprimé Auteurs : Li-Piin Sung, Auteur ; Maria E. Nadal, Auteur ; Mary E. McKnight, Auteur ; Egon Marx, Auteur ; Brent Laurenti, Auteur Année de publication : 2002 Article en page(s) : p. 55-63 Note générale : Bibliogr. Langues : Américain (ame) Tags : Orientation  particule  Aluminium  Pigment  métallique  Réflectivité  Feuil  Propriété  optique  Peinture  métallisée  Industrie  automobile  Matériau  revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : A set of aluminum-flake pigmented coatings having different flake orientations was prepared using various spraying conditions. The flake surface topography and the orientations of individual flakes were determined from images obtained by laser scanning confocal microscopy. Reflectance measurements were carried out to quantify the optical properties of the coatings. Both a Gaussian distribution (used to represent the measured flake orientation distribution) and a topographic map (including local surface roughness and orientation) of the flakes were then used as input to a ray scattering model to calculate the optical reflectance of each coating. Flake orientation distributions and examples of measured optical reflectance as a function of scattering angle are shown, and the latter are compared to calculated reflectance values. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5632 [article]

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Specular gloss scales comparison between the national institute of standards and technology and the national research council of Canada / Maria E. Nadal in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 75, N° 943 (08/2003)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 75, N° 943 (08/2003) . - p. 45-51 Titre : Specular gloss scales comparison between the national institute of standards and technology and the national research council of Canada Type de document : texte imprimé Auteurs : Maria E. Nadal, Auteur ; Mario Nöel, Auteur ; Joanne C. Zwinkels, Auteur Année de publication : 2003 Article en page(s) : p. 45-51 Note générale : Bibliogr. Langues : Américain (ame) Tags : Amérique  Nord  Propriété  optique  Mesure  comparative  Etalonnage  Canada  Organisation  nationale  Organisme  normalisation  Equation  état  Brillant Index. décimale : 667.9 Revêtements et enduits Résumé : The gloss value of a test sample is determined relative to a standard, generally a polished piece of black glass. Therefore, gloss is a dimensionless quantity whose accurate determination requires standardized experimental conditions such as spectral distribution of the incident beam of light, incident and viewing angles, and a gloss standard. To help manufacturers monitor and assess specular gloss, the National Institute of Standards and Technology (NIST) Physics Laboratory provides a special test service to calibrate gloss reference standards. This facility is built around a newly rebuilt reference goniophotometer—an instrument that measures flux as a function of angles of illumination or observation—and a newly developed primary gloss standard—three wedges of highly polished, high-quality optical glass. The system has an overall (k = 2) uncertainty of 0.4%. The new service offers calibration measurements of industry working gloss standards at the specular geometries of 20°, 60°, and 85°, in compliance with the International Standards Organization (ISO) 2813 and the American Society for Testing and Materials (ASTM) D 523 documentary standards. This article describes a bilateral comparison of specular gloss scales between NIST and the National Research Council of Canada (NRCC) that has been performed. The results of this comparison show agreement within the combined uncertainties for the measurement of specular gloss of highly polished black glass. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5576 [article]

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