Comparison of asphere measurements by tactile and optical metrological instruments
| Autor: | R H Bergmans, G Blobel, A. Kung, S Stuerwald, M Baas, H Nouira, H J Nieuwenkamp, G Baer, Gerjo Kok, M Tevoert |
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| Přispěvatelé: | Publica |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
OM - Opto-Mechatronics
Aperture Zernike polynomials Comparison measurement Nano-metrology High Tech Systems & Materials Imaging techniques law.invention symbols.namesake Units of measurement Optics law Micro-metrology Instrumentation Engineering (miscellaneous) Very large telescope Physics Very Large Telescope TS - Technical Sciences Industrial Innovation business.industry Applied Mathematics Conical surface Optical measuring instrument Topography measurement Metrology Lens (optics) symbols Measuring instrument Measuring instruments Nano Technology Measurement strategies Electronics Optical data processing business Aspheres Coordinate measuring machines |
| Zdroj: | Measurement Science and Technology, 10, 26 |
| Popis: | A comparison of topography measurements of aspherical surfaces was carried out by European metrology institutes, other research institutes and a company as part of an European metrology research project. In this paper the results of this comparison are presented. Two artefacts were circulated, a small polymer coated aspherical lens with a clear aperture of about 12 mm, and a large conical convex lens with a clear aperture of 300 mm developed for the ESO Very Large Telescope. The participating laboratories were allowed to follow their own measurement strategies. Both tactile and optical measuring instruments were used, as well as single point and imaging techniques. The measured data were compared with respect to the root-mean-square (RMS), peak-to-valley and Zernike polynomial representations of the measured deviations from the nominal shape. The comparison shows for five out of eight measuring instruments/methods a very good agreement of the measured topographies within 14 nm (RMS). |
| Databáze: | OpenAIRE |
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