Surface characterization with white-light interferometry

The TopMap Metro.Lab from Polytec is a high-precision white-light interferometer (coherence scanning interferometer) with a large vertical range and nanometer resolution. This means the Metro.Lab topography measurement system is ideally suited to the non-contact measurement of flatness, step heights and parallelisms of large surfaces and structures even on soft and delicate materials.

Being a complete measuring station, the TopMap Metro.Lab is the optimum solution when you want to measure large-area topographies on almost all surfaces. The large vertical measurement range of 70 mm allows you to perform measurements with subnanometer resolution, even under difficult conditions.

Since it offers great value for money, the TopMap Metro.Lab is particularly attractive to use, whether you’re working in the metrology lab or close to production. It handles many tasks that you would previously have used tactile systems for. As with all TopMap systems, the open software architecture also enables you to program routine tasks or set up your very own user interface.


  • Non-contact due to the optical, interferometric measurement principle
  • Measurement also possible on steep sections (e.g. drill holes) due to the telecentric lens
  • Flexible due to 70 mm range
  • Fast measurements of large areas too
  • Large measurement field of up to approximately 80 x 80 mm with the enhanced version
  • Easy-to-use and automatable software, generates DIN / ISO compliant parameters
  • Suitable for almost all surfaces, even those with very different reflectivities, due to Smart Surface Scanning
  • Can be integrated in a dust-protected and vibration-dampened workstation for use in machine halls

Optical surface metrology - see more details

Free guide on how to: Measurement System Analysis

Every measurement - whether with tactile or optical surface profilers - is subject to uncertainty. The measured values obtained are the basis for quality-controlled production and are thus a key component of quality assurance. However, the correctness of any conclusion drawn by a measurement depends not only on the suitability of the parameter, but also on how accurately and how reliably the measured values reflect the real conditions. Only if the measured value can be determined with a sufficiently small uncertainty in relation to the tolerance of the characteristic, the measurement process is suitable for the inspection task. This paper describes approaches and helpful capability figures of Measurement System Analysis (MSA).

Read in the free guide how to deal with measurement uncertainty for your Quality Assurance!

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