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  2. ISO 25178 - Wikipedia

    en.wikipedia.org/wiki/ISO_25178

    A consortium of several companies started to work in 2008 on a free implementation of 3D surface texture parameters. The consortium, called OpenGPS [1] later focused its efforts on an XML file format (X3P) that was published under the ISO standard ISO 25178-72.

  3. Moody chart - Wikipedia

    en.wikipedia.org/wiki/Moody_chart

    In engineering, the Moody chart or Moody diagram (also Stanton diagram) is a graph in non-dimensional form that relates the Darcy–Weisbach friction factor f D, Reynolds number Re, and surface roughness for fully developed flow in a circular pipe. It can be used to predict pressure drop or flow rate down such a pipe.

  4. Surface roughness - Wikipedia

    en.wikipedia.org/wiki/Surface_roughness

    The basic GD&T symbol for 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.

  5. 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 ...

  6. Surface imperfections (optics) - Wikipedia

    en.wikipedia.org/wiki/Surface_imperfections_(optics)

    Roughness, texture or optical finish is a defect that originates from the element's manufacturing. Texture is a periodical phenomenon with a high spatial frequency (or in other words, in small dimensions), which affects the entire surface and causes the scattering of incident light. [7] A higher value of roughness means a rougher surface. [7]

  7. Abbott-Firestone curve - Wikipedia

    en.wikipedia.org/wiki/Abbott-Firestone_curve

    Mathematically it is the cumulative probability density function of the surface profile's height and can be calculated by integrating the probability density function. [2] The Abbott-Firestone curve was first described by Ernest James Abbott and Floyd Firestone in 1933. [3] [4] It is useful for understanding the properties of sealing and ...

  8. Oren–Nayar reflectance model - Wikipedia

    en.wikipedia.org/wiki/Oren–Nayar_reflectance_model

    Diagram of surface reflection. The surface roughness model used in the derivation of the Oren-Nayar model is the microfacet model, proposed by Torrance and Sparrow, [2] which assumes the surface to be composed of long symmetric V-cavities. Each cavity consists of two planar facets.

  9. Surface finish - Wikipedia

    en.wikipedia.org/wiki/Surface_finish

    Surface finish, also known as surface texture or surface topography, is the nature of a surface as defined by the three characteristics of lay, surface roughness, and waviness. [1] It comprises the small, local deviations of a surface from the perfectly flat ideal (a true plane ).