|Title:||Metrological set-up for calibrating two dimensional grid plates with sub-micrometre precision|
|Authors:||Klobucar, Rok, University of Maribor, Faculty of Mechanical Engineering, Maribor, Slovenia
McCarthy, Michael, University College London, Faculty of Engineering Science, London, UK
Acko, Bojan, University of Maribor, Faculty of Mechanical Engineering, Maribor, Slovenia
|Contributors:||HostingInstitution: Physikalisch-Technische Bundesanstalt (PTB), ISNI: 0000 0001 2186 1887|
|Resource Type:||Text / Article|
|Publisher:||Physikalisch-Technische Bundesanstalt (PTB)|
CC BY 4.0
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SHA256 Checksum: 81e4f79f6eabcc46b0028f64e8e15a5d3f7605dcd82f3dee252882c9e782de25
|Keywords:||grid plates ; optical coordinate metrology ; calibration ; traceability ; laser interferometry|
|Abstract:||Optical coordinate measuring machines, in preference to tactile based systems, are widely used to support industrial production by providing fast and reliable 2D and 3D metrology on manufactured components. As a consequence, the need for traceable optical reference standards to support such instrumentation is constantly growing. Calibration, verification and error correction of 2D optical instruments , such as profile projectors, microscopes and “vision” systems are mainly based on measuring 2D reference grid plates. A high resolution 2D measurement instrument developed for calibrating precision grid-plates up to 300 mm x 200 mm in size with sub-micrometre measurement uncertainty is presented in this paper. The mechanical concept of this instrument is based around a custom designed, numerically controlled multi-axis granite stage manufactured by Newport Micro-Controle Spectra-Physics, but developed to meet the metrological requirements of the Laboratory for Production Measurement (LTM) at the University of Maribor.
The aim of the development presented here was not to establish the highest metrological level in this field, but more importantly to align with customers’ needs, budgets and expectations within Slovenia and some neighbouring countries. Customers such as calibration laboratories and industrial companies require affordable calibrations with acceptable precision . Considering all expectations combined with funding limitations, it was decided to create a fully automated grid plate measuring system for economically calibrating grid plates with dimensions up to 300 mm x 200 mm while providing an expanded measurement uncertainty below 1 µm over the entire measurement range .
|Other:||This article is based on a presentation at the conference "MacroScale 2017 - Recent developments in traceable dimensional measurements", VTT MIKES Espoo, (Finnland), 17th-19th October 2017.|