Three dimensional (3D) surface measurements based on (2D) stylus instrument
S. Z. Zahwi, A. Mekawi
Abstract:
Three dimensional measurements (3D) of surface topography are increasingly being recognized as the most adequate method for obtaining a better understanding of surfaces. The dimensional and surface metrology department at the National Institute for Standards in Egypt (NIS) developed a computer-controlled system for 3D surface measurements. The developed system is based on a 2D surface measuring instrument using a stylus contact method. A positioning table is used to displace the specimen underneath the stylus in a cross direction to the traverse stroke. The system can scan small areas on the measured surface (5.6 mm × 0.56 mm) by traversing the stylus of the measuring instrument over the surface in parallel traces. The system consists of a “Talysurf 10” stylus surface measuring instrument interfaced to an “IBM” compatible PC computer with a data acquisition device (DAQ). The (DAQ) is used to control the movement of the measuring stroke of the pick up in the X – axis, to control the movement of the positioning table in a cross direction to the stroke as Y- axis, and to take the data of each profile from the stylus vertical movements during the measurement stroke as Z-axis.
The software for the mentioned controls is made using “Labview” programming language. All data of the 3D surface are taken using unfiltered skid less mode of operation. A “Matlab” software is developed and used to take out the trend of the surface using a least square surface plane, then an approximation of a Gaussian filter (moving average) is used to filter the data. A software to analyze the data to get the 3D surface parameters and functions is also developed.
Keywords:
Surface; measurements; stylus; instrument; three dimensions; topography
Download:
IMEKO-TC14-2007-13.pdf
DOI:
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Event details
IMEKO TC:
TC14
Event name:
TC14 ISMQC 2007
Title:

9th Symposium on Measurement and Quality Control in Manufacturing

Place:
Chennai/Madras, INDIA
Time:
21 November 2007 - 24 November 2007
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