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Optotop® – Optical Surface Tester

Surface profile is a key parameter of a product's quality, which affects the product's overall performance. The height values (oftenly refers to the valleys and peaks) of the surface determines many functional features, eg. abrasion resistance, adhesion, etc.

Furthermore, the analysis of wear or abrasion rate after the mechanical tests is also needed to evaluate the quality of surface coatings. Therefore, an accurate measurement and documentation of the surface profile helps to make the right decision for the quality control.

Optotop® is a testing instrument which measures the surface profile in a non-contact fashion. The highly accurate measurement of the 3D topography makes it widely used in R&D for new materials development as well as in the quality control of manufacturing processes.

Parameters which can be measured with Optotop® include:

  • Roughness
  • 3D Topography/Mapping
  • Macro & micro geometries
  • Light intensity
  • Porosity
  • Effective contact area ratio


  • Easy and comfortable handling
  • Rapid data acquisition
  • Robust measuring method for various materials, coatings and samples
  • Micro roughness index number for linear profile
  • Direction-derived roughness index number of areas (texture-orientation analysis)
  • Topography as 2-D-line profile, 3-D-display and height profile


1. Printing Paper

Optotop® Printing Paper

For paper fibers, the distribution of the fibers and microstructure of the paper are the key parameters for the determination of the quality, homogeneity and functionality of a printing paper.

2. Fresnel Lens

Optotop® fresnel lens

3. Structured Leather

Optotop® structured leather

Technical Data

Sensor: Chromatic Confocal
Test range Z*: 300 μm 1 mm 2 mm
Resolution Z*: 12 nm 25 nm 75 nm
Lateral resolution: 1.55 μm 2 μm 4 μm
Measuring distance: 11 mm 12.7 mm 16.4 mm
Measuring frequency: 30 Hz, 100 Hz, 300 Hz, 1 kHz
Standard test range XY: 60 mm x 60 mm
Velocity: 0.1 to 10 mm/s
Standard table size: 165 mm x 165 mm or customized

*Further sensors, test ranges and resolutions on request. Data refers to optimised measuring parameters.

Optotop® - Optical Surface Tester