NEW FRONTIERS IN ANGLE METROLOGY AT THE PTB |
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| Ralf D. Geckeler, Michael Krause, Andreas Just, Oliver Kranz, Harald Bosse |
- Abstract:
- An overview of the current status of angle metrology at the Physikalisch-Technische Bundesanstalt (PTB), the National Metrology Institute of Germany, is provided. Current and future challenges to angle metrology are described. Novel developments at the PTB are outlined. Our research programme is currently strongly influenced by the European Metrology Research Programme (EMRP) SIB 58 Angle Metrology project. We present our novel selfcalibration method for the fast and precise in-situ calibration of angle encoders without recourse to external reference standards which relies on a suitable geometric arrangement of multiple heads which read out the radial grating of the encoder at different angular positions. Additional progress has been achieved in this field by adapting an advanced error-separating shearing technique to angle metrology and by testing it experimentally. This technique, by applying defined angle offsets between two angle measuring devices, offers a unique opportunity to cross-calibrate both devices. We also present progress in the development of a novel concept and of a device for the precise and traceable calibration of spatial angles, the Spatial Angle Autocollimator Calibrator (SAAC). We report on the status of the first European Association of National Metrology Institutes (EURAMET) Key Comparison on autocollimator calibration (EURAMET.L-K3.2009).
- Keywords:
- angle measurement, angle standard, angle encoder, autocollimator, traceability
- Download:
- IMEKO-TC14-2014-02.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC14
- Event name:
- TC14 LMPMI Symposium 2014
- Title:
11th Symposium on Laser Metrology for Precision Measurement and Inspection in Industry
- Place:
- Tsukuba, JAPAN
- Time:
- 03 September 2014 - 05 September 2014