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Surface finish may be measured in two ways: contact and non-contact methods. Contact methods involve dragging a measurement stylus across the surface; these instruments are called profilometers . Non-contact methods include: interferometry , digital holography , confocal microscopy , focus variation , structured light , electrical capacitance ...
Surface finish, also known as surface texture or surface topography, is the nature of a surface ... Contact methods involve dragging a measurement stylus across the ...
Surface roughness can be regarded as the quality of a surface of not being smooth and it is hence linked to human perception of the surface texture. From a mathematical perspective it is related to the spatial variability structure of surfaces, and inherently it is a multiscale property.
An unfinished surface is often called mill finish. Surface finishing processes can be categorized by how they affect the workpiece: Removing or reshaping finishing; Adding or altering finishing; Mechanical processes may also be categorized together because of similarities in the final surface finish.
Most of the world's surface finish standards are written for contact profilometers. To follow the prescribed methodology, this type of profilometer is often required. Contacting the surface is often an advantage in dirty environments where non-contact methods can end up measuring surface contaminants instead of the surface itself.
ISO 25178: Geometrical Product Specifications (GPS) – Surface texture: areal is an International Organization for Standardization collection of international standards relating to the analysis of 3D areal surface texture.
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