Surface Metrology Guide

Surface metrology makes it possible to control numerous functions on mechanical components and manufactured objects. Reducing wear of a moving part and increasing its lifespan, ensuring sealing between shafts and seals, decreasing fuel consumption and reducing carbon dioxyde emissions, optimizing efficiency of solar cells, obtaining luxurious aspects on brushed metal surfaces, reducing heating in electronic components, making autocleaning surfaces, etc. All these functions can be obtained by programming and controlling specific surface texture. This guide, freely proposed by Digital Surf, contains numerous resources for self-training and for adoption of good practices. The company Digital Surf has been strongly involved in surface texture analysis for more than twenty years, via François Blateyron, who has been an active member of standardization committees in France and at ISO/TC 213. This activity has allowed Digital Surf to contribute to standard development and made it possible to develop advanced features in MountainsMap® based upon early drafts of the standards and therefore offer ready-to-use tools as soon as the standard is published.

Areal parameters

Introduction to Surface Texture

History of surface texture metrology until the latest ISO 25178 standard on areal surface texture.

Areal Field Parameters

Areal field parameters from ISO 25178-2, with amplitude parameters (Sa, Sq, etc.) and spatial and hybrid parameters (Sdr, Sal, etc.).

Areal Functional Parameters

Areal functional parameters on bearing ratio, Sk parameters, functional indices and volume parameters, largely used in the automotive industry.

Areal Feature Parameters

Areal feature parameters calculated by segmentation, that allows the characterization of specific structures.

Profile parameters

Profile Parameters

Panorama of parameters defined in various standards for the evaluation of roughness and waviness profiles.

Parameters from ISO 21920

Introduction to the new standard that will modernize profilometry and that should replace all previous profile standards.

Parameters from ISO 4287

Introduction to the classical roughness parameters, in particular Ra, Rz or RSm, and their waviness and primary equivalent.

Parameters from ISO 12085

This standard is used in the automotive industry to caracterize profile motifs, close to functional requirements.


Metrology Courses in Video

Series of on-line video courses about surface texture metrology. The videos are free to use. They are available in English or inFrench with English sub-titles.

Selected Bibliography

Comprehensive bibliography of scientific papers and metrology books that are useful for surface texture analysis.

Metrology Standards

This section provides a list of important ISO and national standards in the field of surface texture.

Test your knowledge in metrology

Verify your knowledge in surface metrology with 10 questions (answers provided at the end).

Operations and Analyses

Leveling and Form Removal

Méthodes de redressement et de suppression de forme à appliquer pour la création du profil primaire ou de la surface SF

Filtration Techniques

Explore filtration operators and several filters defined in ISO 16610 as well as other innovative applications.

Fractal analysis

A powerful multi-scale geometrical analysis to explore profile and surface behaviors and their relation to function.

Freeform surface analysis

Learn about the next revolution on surface analysis, suitable for additive manufactured surfaces.

  Introduction to surface texture specification and verification

This video introduces the reasons why surface texture is specified and verified on engineered products, and gives the basic concepts you should know before using surface texture analysis. Duration: 10 min 58