A New Technique for Classifying Random Surface Roughness

1967 ◽  
Author(s):  
Bruce D. Van Deusen ◽  
Gerald E. Mccarron
Keyword(s):  
Surface Roughness ◽  
New Technique ◽  
Random Surface ◽  
A New Technique

scholarly journals X-Ray Reflectivity Measurements of Surface Roughness Using Energy Dispersive Detection

1990 ◽  
Vol 208 ◽  
Author(s):  
E. Chason ◽  
D. T. Warwick
Keyword(s):  
Surface Roughness ◽  
Excellent Agreement ◽  
Ion Bombardment ◽  
Energy Dispersive ◽  
New Technique ◽  
Scattering Angle ◽  
X Ray ◽  
Growth Chambers ◽  
A New Technique ◽  
Better Than

ABSTRACTWe describe a new technique for measuring X-ray reflectivity using energy dispersive X-ray detection. The benefits of this method are the use of a fixed scattering angle and parallel detection of all energies simultaneously. These advantages make the technique more compatible with growth chambers and useable with laboratory X-ray sources. We find excellent agreement between the calculated Fresnel reflectivity and the reflectivity obtained from a smooth Ge (001) surface. Reflectivities obtained during 500 eV Xe ion bombardment of Ge surfaces demonstrate the sensitivity of the technique to be better than 1 Å.

In-Process Measurement of Surface Roughness in Turning by Laser Beams

1981 ◽  
Vol 103 (2) ◽  
pp. 203-209 ◽  
Author(s):  
M. Shiraishi
Keyword(s):  
Surface Roughness ◽  
Optical Method ◽  
Experimental Results ◽  
Laser Beams ◽  
New Technique ◽  
Process Measurement ◽  
Feed Direction ◽  
A New Technique

A new technique for in-process measurement of surface roughness is introduced which employs an optical method by using double laser beams. This makes it possible to detect the surface roughness not only along the circumferential path but also along the feed direction even during machining. The experimental results show that the presence of chipping and chattering can be detected sensitively along both measurements directions and the maximum roughness value is always obtainable from the reading along the feed direction.

Heat Transfer From Protuberances and Simulated Ice Accretion Roughness Elements

2009 ◽  
Author(s):  
Steven R. Mart ◽  
Stephen T. McClain
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Surface Roughness ◽  
Wind Tunnel ◽  
Roughness Element ◽  
New Technique ◽  
Gold Deposition ◽  
Ice Accretion ◽  
Roughness Elements ◽  
A New Technique

The heat transfer phenomena occurring during the initial phases of in-flight ice formation and accumulation on aircraft surfaces are not completely understood. The aim of this investigation was to quantify the local apparent heat transfer enhancement on surface roughness elements intended to mimic the early stages of ice accretion. In order to achieve this objective, a new technique for mounting gold-deposition Mylar film in a gold-side down orientation was developed and tested. Gold deposited Mylar film is commonly used to establish a constant heat flux convective boundary condition for wind-tunnel test surfaces. However, the accepted mounting technique causes problems if the films are used to explore convective heat transfer from surfaces with high thermal conductivity protuberances and surface roughness. To overcome the problems with roughness-element attachment, a new technique for mounting gold-deposition Mylar film in a gold-side down orientation was developed and tested. After validating the new mounting procedure, a large test plate was created following the same technique and was mounted in a wind tunnel. Using infrared thermometry to acquire temperature profiles of a gold Mylar heated flat plat prepared with three hemi-spherical roughness elements of varying thermal conductivity, the apparent enhancement of the elements was evaluated for varying tunnel velocities. Flow characteristics at and behind the roughness elements were also examined using the infrared images. This study presents the results of the new Mylar film mounting procedure and the apparent enhancement and flow results.

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