@inproceedings{1046024,
  abstract     = {{Since the terroristic attacks in 2001, a lot of important government buildings, embassies and critical public infrastructure (railway stations, airports) are protected against blast load. Most of these buildings have standard glazing with float glass, and replacing all float glass with tempered or laminated glass would be too expensive. Therefore the glass windows are retrofitted with safety film, a thermoplastic polyester film that sticks to the glass and holds all glass fragments together when the glass is breaking. These safety films are also applied as protection against hurricanes and burglary.
As the exact physical mechanisms of the interaction between glass and safety film are not understood quite well, research is conducted on the assembly of float glass retrofitted with safety film. Also the adhesive between glass and safety film plays a big role, as well as the tin and air side of the glass.
Because the loadings on the glass/film assembly are typically dynamic (blast, wind pressure, impact), the lab tests are done on a drop weight set-up, where a mass is falling on the glass plate, retrofitted with safety film.
In this paper, the instrumentation of the drop weight setup with projection moire measurement is presented, so that the time history of the out-of-plane deformations of the glass/film assembly can be investigated. On the back side of the specimen a high intensity infrared grating was projected and the whole process was recorded by a high speed camera. For the processing of the projected moire fringes, dedicated phase wrapping algorithms were needed because the fracturing of the glass causes a lot of discontinuities in the phase. 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.}},
  author       = {{Shulev, Assen and Van Paepegem, Wim and De Pauw, Sijn and Stoikova, Elena and Degrieck, Joris and Sainov, Ventseslav}},
  booktitle    = {{Optical Measurement Techniques for Systems and Structures : proceedings of the 4th International conference}},
  editor       = {{Dirckx, Joris and Buytaert, Jan}},
  isbn         = {{9789042303669}},
  keywords     = {{FOURIER-TRANSFORM PROFILOMETRY,FRINGE-PATTERN-ANALYSIS,AUTOMATIC-MEASUREMENT,INTERFEROMETRY,TOPOGRAPHY,OBJECT SHAPES}},
  language     = {{eng}},
  location     = {{Antwerp, Belgium}},
  pages        = {{369--377}},
  publisher    = {{Shaker}},
  title        = {{Projection moiré measurement of glass specimens retrofitted with safety film}},
  year         = {{2009}},
}

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