Group Geometrical Inline Measurement Systems

The group’s research focuses on developing measurement systems that perform contactless, high-precision inline measurements on the geometry and 3D surface structure of complex components, providing measurement data in real time. To do this, ultra modern optical measurement techniques, such as digital holography and speckle correlation, are combined with exceptionally fast evaluation procedures. This creates systems that, for the first time, are allowing gear geometries to be optically scanned in just a few seconds, workpieces to be measured directly in machine tools with the utmost precision, and the smallest stress-induced component deformations and cracks to be identified.

Inline component testing

  • 100% topography control of precision parts
  • Measurement field size can be scaled to suit specific applications (currently available 15 x 15 mm2 to 190 x 150 mm2)
  • Measurement accuracy: axial below 0.2 μm, lateral depending on size of image field and camera option 3 μm to 30 μm
  • Measurement time: below 0.1 s for 3D images with 10 million points
  • Flexible working distance up to approx. 300 mm, mechanical focusing eliminated

Gear measurement

  • Comprehensive gear flank control within a few seconds
  • Single spot measurement accuracy below 1 µm
  • Spur and helical gears captured
  • Active suppression of multiple reflections on the gear flanks
  • Contactless measurement, even on moving objects

Dynamic deformation measurement

  • Temporally resolved imaging measurements with a frame rate of up to 1 kHz
  • Image field of 10 x 10 mm2
  • Measurement accuracy below 0.5 µm
  • Non-contact and marker-free up to 1000 °C
  • Strain-controlled short cycle strength analysis, load measurement, and crack assessment
  • Standard-compliant fatigue testing in just one hour of measurement time
  • Electronic speckle pattern interferometry (ESPI) and Digital Image Correlation (DIC)