Journal ArticleDOI
Introduction to Surface Roughness and Scattering
Reads0
Chats0
About:
This article is published in Precision Engineering-journal of The International Societies for Precision Engineering and Nanotechnology.The article was published on 1991-01-01. It has received 369 citations till now. The article focuses on the topics: Surface roughness & Scattering.read more
Citations
More filters
Dissertation
Métrologie des dimensions critiques : scatterométrie et développements avancés
TL;DR: In this paper, the authors present a troisieme chapitre dedicated to the applications of metrologie adaptes permettant un controle en ligne in the field of nanotechnologies.
DissertationDOI
Ultrasonic thickness structural health monitoring of steel pipe for internal corrosion
Abstract: The naphthenic acid corrosion that can occur in oil refinery process plants at high temperature (400°C) due to the corrosive nature of certain crude oils during the refining process can be difficult to predict. Therefore, the development of online ultrasonic thickness (UT) structural health monitoring (SHM) technology for high temperature internal pitting corrosion of steel pipe is of interest. A sensor produced by the sol-gel ceramic fabrication process has the potential to be deployed to monitor such pitting corrosion, and to help investigate the mechanisms causing such corrosion. This thick-film transducer is first characterized using an electric circuit model. The propagating elastic waves generated by the transducer are then experimentally characterized using the dynamic photoelastic visualization method and images of the wave-field are compared with semi-analytical modeling results. Next, the classic elastic wave scattering theory for an embedded spherical cavity is reviewed, results are compared with a newer scattering theory from the seismology community, that has been applied to a hemispherical pit geometry. This hemispherical pit theory is extended so as to describe ultrasonic Non-Destructive Evaluation (NDE) applications, for pitting corrosion, with the derivation of a far-field scattering amplitude term. Data from this new scattering theory is compared with experimental results by applying principals from the Thompson-Gray measurement model. The initial model validation provides the basis for a possible new hemispherical pit geometric reference standard for ultrasonic NDE corrosion applications. Next, UT SHM measurement accuracy, precision, and reliability are described with a new weighted censored relative likelihood methodology to consider the propagation of asymmetric uncertainty in quantifying thickness measurement error. This new statistical method is experimentally demonstrated and applied to thickness measurement data obtained in pulse-echo and pitch-catch configurations for various time-of-flight thickness calculation methods. Finally, the plastic behavior of a corroded steel pipe is modeled with analytical and finite element methods to generate prognosis information.
Proceedings ArticleDOI
Sophisticated light scattering techniques from the VUV to the IR regions
TL;DR: In this paper, the authors report on the development of instruments for total and angle resolved light scattering measurements at wavelengths ranging from the vacuum ultraviolet to the infrared spectral regions, which are well suited to meet the challenging requirements for fast and sensitive finish assessment of optical surfaces.
Journal ArticleDOI
Backscattering measurements from double-scale randomly rough surfaces.
TL;DR: Experimental measurements of light backscattered from double-scale randomly rough surfaces (oceanlike surfaces) with different statistical parameters illuminated at small and large angles of incidence find that the backscattering light is strongly depolarized mainly at small angles of incident and strong shadowing effects are present for large angle of incidence.
Proceedings ArticleDOI
Quality assessment of engineering surfaces by infrared scattering
TL;DR: In this article, the surface power spectral density is calculated from the scattering distribution by Rayleigh-Rice vector perturbation theory, and surface roughness is measured for ground and polished surfaces in the root mean square roughness range of 0.03 to 1.7 micrometers.