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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 ...
Non-Contact Optical Profilometer A contact profilometer at LAAS technological facility in Toulouse, France. A profilometer is a measuring instrument used to measure a surface's profile, in order to quantify its roughness. Critical dimensions as step, curvature, flatness are computed from the surface topography.
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 , confocal microscopy , focus variation , structured light , electrical capacitance , electron microscopy ...
The vertical uncertainty depends mainly on the roughness of the measured surface. For smooth surfaces, the accuracy of the measurement is limited by the accuracy of the positioning stage. The lateral positions of the height values depend on the corresponding object point that is imaged by the pixel matrix.
Areal roughness parameters are defined in the ISO 25178 series. The resulting values are Sa, Sq, Sz,... Many optical measurement instruments are able to measure the surface roughness over an area. Area measurements are also possible with contact measurement systems. Multiple, closely spaced 2D scans are taken of the target area.
Topographical instruments: contact and non-contact 3D profilometers, ... This data is then used to calculate a surface data set for roughness measurement.
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