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Surface Features
Published in Wolfgang Osten, Optical Inspection of Microsystems, 2019
Scale-limited surfaces (as shown in Figure 2.1) provide a flexible way of identifying the various scales of surface features that specify different manufacturing technologies in a more responsive and customized way. A scale-limited surface depends on the filter or operator used and is controlled by the nesting index of that filter or operator. The F-operator is to remove the form from a measured surface. It is used to find a reference surface or a datum for the assessment of the surface topography. The S-filter (low-pass filter) is used to eliminate small scalar components that are considered irrelevant, for example, instrument noise and instrument imperfections. The L-filter (high-pass filter) preserves the short wavelength features while rejecting the longer ones. Two important factors that need to be considered are the filter type and nesting index, traditionally called the cut-off length of a filter (for linear filters only). The default areal filter and filter nesting index are defined in ISO 16610-61 [14] and ISO 25178 Part 3 [7]. As illustrated in Figure 2.1, an SF surface is obtained by using an S-filter and an F-operator on a measured surface, and an SL surface is obtained by using an L-filter on an SF surface. Both the SF surface and the SL surface are called scale-limited surfaces.
DTM Surfaces – Metrology – Characterization
Published in R. Balasubramaniam, RamaGopal V. Sarepaka, Sathyan Subbiah, Diamond Turn Machining, 2017
R. Balasubramaniam, RamaGopal V. Sarepaka, Sathyan Subbiah
The unfiltered primary profile (P-profile) is the actual measured surface profile. Filtering it in accordance with ISO 11562/ISO 16610-21 produces the waviness profile (W-profile) and the roughness profile (R-profile). The variable for determining the limit between waviness and roughness is the cut-off λc. The profile type is identified by the capital letters P, R or W.
Post-Process Surface Metrology
Published in Richard Leach, Simone Carmignato, Precision Metal Additive Manufacturing, 2020
Nicola Senin, Francois Blateyron
To support feature-based characterisation, the current set of segmentation methods (ISO 25178-2 2012) and related feature-based parameters (ISO 16610-85 2013) will be extended to include other segmentation methods and new parameters potentially suitable for the characterisation of AM surfaces.
Tribological Behavior of Surfaces Obtained by Turning in Sintered Self-Lubricating Composites
Published in Tribology Transactions, 2021
Felipe Gustavo Ebersbach, Gisele Hammes, José Daniel Biasoli de Mello, Rolf Bertrand Schroeter, Cristiano Binder, Aloísio Nelmo Klein
The turned surfaces were analyzed using the root mean square height (Sq), texture aspect ratio (Str), surface bearing index (Sbi), and skewness (Ssk). These parameters were obtained in six 4 mm2 regions using a white light interferometer, and data processing was performed with the aid of the image analysis software and surface metrology. The values of topographical parameters were obtained after removing the cylindrical shape and waviness using a robust Gaussian filter on the surfaces according to ISO 16610-71 (39).