Projection moiré measurement of glass specimens retrofitted with safety film

A. Shulev; W. Van Paepegem; E. Stoykova; S. De Pauw; J. Degrieck; V. Sainov

doi:10.1117/12.822463

19 December 2008 Projection moire measurement of glass specimens retrofitted with safety film

A. Shulev, W. Van Paepegem, E. Stoykova, S. De Pauw, J. Degrieck, V. Sainov

Proceedings Volume 7027, 15th International School on Quantum Electronics: Laser Physics and Applications; 70270O (2008) https://doi.org/10.1117/12.822463
Event: 15th International School on Quantum Electronics: Laser Physics and Applications, 2008, Bourgas, Bulgaria

Abstract

Protection of buildings and critical public infrastructure against blast load has been recently improved by retrofitting glass windows with a safety film. As the exact physical mechanisms of the interaction between glass and safety film are not quite well understood, intensive research is conducted on the properties of this assembly. The loadings on the glass/film assembly are typically dynamic (blast, wind pressure, impact), so the lab tests are done on a drop weight set-up, where a mass is falling on a retrofitted glass plate. In this work, the drop weight setup was combined with pattern projection (moire) technique to study the time history of the out-of-plane deformations of the glass/film assembly. The fringe pattern, projected on the back side of the specimen, was generated by means of a sinusoidal phase grating under divergent high intensity infrared illumination. The whole process was recorded with a high speed camera. Local routines based on Fast Fourier Transform were used to process the captured images, and to extract the phase. The exact out-of-plane displacements were calculated by means of calibration based on previous shape measurements of several different objects with known dimensions.

Citation Download Citation

A. Shulev, W. Van Paepegem, E. Stoykova, S. De Pauw, J. Degrieck, and V. Sainov "Projection moire measurement of glass specimens retrofitted with safety film", Proc. SPIE 7027, 15th International School on Quantum Electronics: Laser Physics and Applications, 70270O (19 December 2008); https://doi.org/10.1117/12.822463

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