Topography & Texture

Topography texture

As technology pushes forward, surfaces are being manufactured with exacting control and the need to measure surface texture with high precision and accuracy has become even more critical. When it comes to roughness measurements, there are 3 important factors: measuring the surface, processing the data, and reporting the results.

Measuring the Surface

Measuring the surface with sufficient precision is critical to making sure your roughness values are accurate. ZYGO's 3D optical profiler systems make collecting precise data quick & simple with ease of use features like SmartSetup™ Technology which will find focus, adjust the measurement parameters, and take a measurement all in a single button click.

Analyzing the Data

With any roughness measurement, the raw data needs to be processed or filtered to separate the roughness from the waviness & shape of the surface.  The ZYGO’s Mx™ software makes it easy filter your surface with ISO-compliant filtering.

Reporting Results

Historically Ra (average roughness) was the go-to result when talking about surface roughness, but it often does not tell the whole story. Depending on the surface, there are numerous other results that might better describe the surface such as:

  • Skewness (Ssk): is the surface dominated by peaks or valleys?
  • Sdr: the developed surface area ratio which the ratio between the surface area when topography is accounted for & the projected area
  • Sdq: the local slope gradient or how rapidly the texture is changing
  • Sal and Str: describe whether a surface is mostly random or periodic/directional

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