Répartition angulaire de la lumière diffusée par un échantillon poli du super-alliage CoCr20WNi (Alacrite XSH) ; application à la détermination des paramètres statistiques caractérisant la rugosité superficielle

Zerrouki, Chouki; Miserey, F.; Pinot, P.

doi:10.1051/epjap:1998143

Cited by 12 publications

(15 citation statements)

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“…In the method used here, the surface is illuminated under oblique incidence by a -polarized monochromatic light, then measurements of the angular distribution of the scattered light are taken in the plane of incidence [3,4] (see Figure 1).…”

Section: Principle Of the Methods And Measurement Proceduresmentioning

confidence: 99%

“…The term is a function of angles and , the dielectric permittivity of the sample, and the polarization of the incident light. The choice ofpolarization (electrical vector parallel to the plane of incidence) has been discussed in a previous paper [13]. In this case, the expression for is [2,8]:…”

Section: Principle Of the Methods And Measurement Proceduresmentioning

confidence: 99%

“…The surface roughness of four kilograms made from XSH alacrite at the Institut National de Métrologie (BNM-INM, France) has been characterized. For this purpose, an optical method based on angle-resolved C. Zerrouki scattering theory was employed [2]. This method was chosen for its subnanometric vertical resolution and its non-destructive character, even for adsorbent layers.…”

Section: Introductionmentioning

confidence: 99%

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The nanometric roughness of mass standards and the effect of BIPM cleaning-washing techniques

1999

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A method based on light scattering has been used to characterize the surface roughness of four standard kilograms made from XSH alacrite, in order to determine the root-mean-square height and the correlation length . The values of these two parameters, which have been found to lie between 2 nm and 5 nm and between 170 nm and 250 nm, respectively, show the high surface quality that it is possible to obtain by mechanical polishing of XSH alacrite. Cartographies made by light scattering, as well as and values, have shown that in spite of identical manufacturing conditions the kilograms present a significant difference in surface roughness. We have observed that the lower bases were in general rougher than the upper ones. This was explained by the different histories of the upper and lower bases. On the other hand, the same value of was found for both bases of a given kilogram. We have also found that the smoother the kilogram, the smaller the mass loss. This clearly shows the effect of surface roughness on the stability of mass standards. Finally, significant variations in the values of and have been observed after the cleaning-washing process at the Bureau International des Poids et Mesures. We have also shown that the variations noted after several successive cleaning-washings are mainly the result of the first of these. This agrees with observations made during earlier gravimetric studies.

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Section: Principle Of the Methods And Measurement Proceduresmentioning

confidence: 99%

Section: Principle Of the Methods And Measurement Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The nanometric roughness of mass standards and the effect of BIPM cleaning-washing techniques

1999

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“…CNAM performs these measurements using its optical roughness-meter [4], [5]. This is based (see Figure 1) on the angular distribution of scattered laser light [6], [7], [8], whereby roughness (rms height and correlation length) is determined from the power spectral density (PSD) of the surface asperities.…”

Section: Presentation Of the Optical Roughness Metermentioning

confidence: 99%

Roughness and contamination characterizations of worn surfaces

Silvestri

Azouigui

Pinot

et al. 2013

16th International Congress of Metrology

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Abstract. The European project IND11 "Metrology to Assess the Durability and Function of Engineered Surfaces" (MADES), piloted by NPL, aims to increase the efficiency and utilization of engineered surfaces by studying wear phenomena. This is to increase the competitiveness of the industry, reducing costs on the one hand, and secondly the impact on the environment. In this context, the joint research laboratory (LNE-CNAM) characterizes the surface and contamination of different materials have undergone wear using an optical roughness-meter and a thermal desorption mass spectrometry device.

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“…As a consequence, the visibility limit is attributed to a well‐defined quantity of the transmitted light through windshields. The surface damage is estimated essentially by the roughness which is characterized by the profile, image defects, or statistical parameters (the root mean square height and correlation length) . The root mean square height parameter Rq is widely used for the roughness characterization.…”

Section: Introductionmentioning

confidence: 99%

A windshields surface characterization damaged by sandblasting

Benterki

Faci

Bouaouadja

2019

Int J of Appl Glass Sci

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The present work is part of a study of windshield glass erosion subjected to the Saharan sand particles projection. The objective is to highlight the effect of the sand grains size Ps on the degradation process of the ordinary glasses surface (damage rate Dr) and to search the visibility limit of vehicles' drivers. Various erosion tests are carried out and have led to different surface states by varying the sand mass Mp and the particles size Ps. The effect of the surface damage on root mean square roughness Rq, damage rate Dr, and optical transmission To are presented. A clear dependence between these three parameters and the particles size has been highlighted. The results show that Rq increases linearly with Ps increasing, whereas the Dr variation in function of Ps obeys a Gaussian function. In addition, a good correlation between the optical transmission loss and the damage rate is found. In terms of the driver's good vision, the damage of the windshield surface depends essentially on the parameter Dr. Therefore, the visibility limit is determined with regard to this parameter which is dependent on the sand particles size.

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Répartition angulaire de la lumière diffusée par un échantillon poli du super-alliage CoCr20WNi (Alacrite XSH) ; application à la détermination des paramètres statistiques caractérisant la rugosité superficielle

Cited by 12 publications

References 0 publications

The nanometric roughness of mass standards and the effect of BIPM cleaning-washing techniques

The nanometric roughness of mass standards and the effect of BIPM cleaning-washing techniques

Roughness and contamination characterizations of worn surfaces

A windshields surface characterization damaged by sandblasting

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