What is it about?
Optical full-field - i.e. camera based - systems for measuring deformation need to be calibrated. Here, the calibration is performed using a physical Reference Material that reproduces fields of strain and deformation based on a cantilever. A protocol for its use had been suggested for both static and dynamic calibrations in a CEN Workshop Agreement. Their application in laboratory environment has been challenged in an international interlaboratory study. We report results of this inter-laboratory study which prove that the Cantilever Reference Material is sufficiently stable and reproducible to be used as a calibration artefact for displacement and strain fields in static and dynamic loading.
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Why is it important?
Traceability of measurement results is of utmost importance. It is established by an unbroken chain of comparisons, of which the first member is the calibration of the measurement system.
Perspectives
While the calibration procedure proved to be viable, the feed-back of the participants led to a number of modifications to the relevant chapter of the CEN Workshop Agreement, for example, as to the estimation of calibration uncertainty. The procedure is presently being modified for an industrial environment in the European Clean Sky 2 project MOTIVATE, see http://www.engineeringvalidation.org
Dr Erwin Hack
Empa
Read the Original
This page is a summary of: An inter-laboratory study of the calibration of optical full-field systems for measuring deformation, The Journal of Strain Analysis for Engineering Design, July 2015, SAGE Publications,
DOI: 10.1177/0309324715590955.
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