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Proceedings Paper

Assessment of a dynamic reference material for calibration of full-field measurement systems
Author(s): Erwin Hack; Mara Feligiotti; Andrea Davighi; Maurice Whelan; Weizhuo Victor Wang; Eann A. Patterson
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Paper Abstract

For holography and speckle interferometry the calibration of the sensitivity is a must, because illumination and observation directions vary across the field of view. A numerical estimate or a static calibration using rigid body motions is standard, and reference materials exist for static strain calibration. Recently, reference materials for the dynamic calibration of optical instruments of displacement and strain measurement were designed and prototypes were manufactured in the European FP7 project ADVISE. We review the properties of the reference material and the concept of traceability for the field of displacement values by using a calibrated single point transducer. The mode shape is assessed using out-of-plane DSPI, Finite Element Analysis as well as analytic solutions of the plate vibration. We present measurements using stroboscopic DSPI on the reference material under acoustic excitation and compare the measured mode shapes to the ones predicted by FE analysis. We apply different comparison methodologies based on point-by-point deviations and on decomposition of the mode shapes into a set of orthogonal basis functions. The latter method is well suited to assess stability and reproducibility of a mode shape. Finally, the deviations are used to estimate the reference material uncertainty which is an essential parameter for determining the calibration uncertainty. Uncertainty contributions of the DSPI set-up are taken into account. To conclude, the application area and limitations of the reference material are discussed.

Paper Details

Date Published: 11 September 2012
PDF: 6 pages
Proc. SPIE 8413, Speckle 2012: V International Conference on Speckle Metrology, 84130U (11 September 2012); doi: 10.1117/12.977950
Show Author Affiliations
Erwin Hack, EMPA (Switzerland)
Mara Feligiotti, EMPA (Switzerland)
Andrea Davighi, Joint Research Ctr. Ispra (Italy)
Maurice Whelan, Joint Research Ctr. Ispra (Italy)
Weizhuo Victor Wang, Univ. of Liverpool (United Kingdom)
Eann A. Patterson, Univ. of Liverpool (United Kingdom)

Published in SPIE Proceedings Vol. 8413:
Speckle 2012: V International Conference on Speckle Metrology
Ángel Fernandez Doval; Cristina Trillo, Editor(s)

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