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  2. Surface roughness - Wikipedia

    en.wikipedia.org/wiki/Surface_roughness

    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.

  3. Surface metrology - Wikipedia

    en.wikipedia.org/wiki/Surface_metrology

    Surface metrology is the measurement of small-scale features on surfaces, and is a branch of metrology. Surface primary form, surface fractality, and surface finish (including surface roughness) are the parameters most commonly associated with the field. It is important to many disciplines and is mostly known for the machining of precision ...

  4. Surface finish - Wikipedia

    en.wikipedia.org/wiki/Surface_finish

    Surface roughness, commonly shortened to roughness, is a measure of the total spaced ... such as molding or metal forming, surface finish of the die determines the ...

  5. Profilometer - Wikipedia

    en.wikipedia.org/wiki/Profilometer

    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.

  6. Waviness - Wikipedia

    en.wikipedia.org/wiki/Waviness

    Waviness is the measurement of the more widely spaced component of surface texture.It is a broader view of roughness because it is more strictly defined as "the irregularities whose spacing is greater than the roughness sampling length".

  7. Lapping - Wikipedia

    en.wikipedia.org/wiki/Lapping

    A typical range of surface roughness that can be obtained without resorting to special equipment would fall in the range of 1 to 30 units Ra (average roughness), usually microinches. Surface accuracy or flatness is usually measured in units of helium light band (HLB), one HLB measuring about 280 nm (1.1 × 10 −5 in). Again, without resort to ...

  8. Eddy-current testing - Wikipedia

    en.wikipedia.org/wiki/Eddy-current_testing

    When it comes to surface applications, the performance of any given inspection technique depends greatly on the specific conditions — mostly the types of materials and defects, but also surface conditions, etc. However, in most situations, the following are true: Effective on coatings/paint: yes; Computerized record keeping: partial

  9. Roughness length - Wikipedia

    en.wikipedia.org/wiki/Roughness_length

    For example, in classical mechanics the coefficient of friction is commonly used to measure the roughness of a surface as it relates to the force exerted on another contacted object. And, in fluid dynamics, hydraulic roughness is a measure of the resistance water experiences when flowing over land or through a channel. All of these measures ...

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