Results of workpackage 4 – Process integrated quality assurance

Work package 4 aims at achieving a stable replication process for optical components through a comprehensive measurement technology. This enables the acceleration of the mould making process and therefore a reduction of costs. For this purpose, measurement of all geometric criteria is essential. Thus different measurement solutions were developed and a data management for the processing of the measurement data was generated.

Main result:

• Taylor Hobson Ltd (Leicester, United Kingdom) has developed a profilometer which is capable of measuring steep sided, aspherical optics with slope angles up to 80° for optics from 1.2 mm to 50 mm diameter.
  
• IBS Precision Engineering bv (Eindhoven, Netherlands) has designed and realised an ultra-precision tactile probe. In combination with a nanopositioning platform, this miniaturised probe system enables ultra-precision coordinate metrology in 3D of a wide range of products.
  
• Fisba Optik AG (St.Gallen, Switzerland) developed an interferometer for the integration into a production machine. Therefore the compensation of external disturbances (e.g. vibrations) by software based methods was essential.
  
• Laboratory for Machine Tools and Production Engineering WZL (Aachen, Germany) developed a software tool for the processing of measurement data and the comparison with design data. The target-actual comparison is done via coarse and best-fit alignment by using different surface information like topography, local slope and curvature.
  

The carried out adaptations of existing measuring systems as well as the realisation of new ones enables now the measuring of a wide range of optical components and therefore the feedback of corrective values into the production process.