Deflectometry

Deflectometry is a technique based on imaging the reflection of a grid (printed on a flat support or displayed on a screen) at the surface of a specularly reflective test sample. It measures the two slope components at the surface of the tested object.

Infrared deflectometry

Presented at the 2019 Annual Conference of the Society for Experimental Mechanics

Deflectometry on curved surfaces

Presented at the 2018 Annual Conference of the Society for Experimental Mechanics

Deflectometry to detect delaminations in impacted composite beams

Presented at the 2011 CompTest conference in Lausanne

Deflectometry and equilibrium gap to detect barely-visible impact damage in composite plates

Presented at the 2013 CompTest conference in Aalborg

Review presentation on deflectometry

Presented at the ASHMCS 2016 conference in Taiwan

List of publications

  • Toniuc H., Pierron F., Infrared deflectometry for surface slope deformation measurements, Experimental Mechanics, vol. 59, n°8, pp. 1187-1202, 2019. https://doi.org/10.1007/s11340-019-00480-9
  • Robin O., O’Donoughue P., Berry A., Farley V., Prithipaul K., Full field vibration measurements on a cantilever beam under impact using visible and infrared deflectometry, Applied Acoustics vol. 183, pp. 108294, 2021. https://doi.org/10.1016/j.apacoust.2021.108294
  • Kaufmann R., Ganapathisubramani B., Pierron F., Reconstruction of surface pressure fluctuations using deflectometry and the Virtual Fields Method, Experiments in Fluids, vol. 61, n°2, art. 35, 2020. https://doi.org/10.1007/s00348-019-2850-y
  • Kaufmann R., Ganapathisubramani B., Pierron F., Surface pressure reconstruction from phase averaged deflectometry measurements using the Virtual Fields Method, Experimental Mechanics,vol. 60, n° 2, pp. 379-392, 2020. https://doi.org/10.1007/s11340-019-00564-6
  • Kaufmann R., Pierron F., Ganapathisubramani B., Full-field surface pressure reconstruction using the virtual fields method, Experimental Mechanics, vol. 59, n°8, pp. 1203–1221, 2019.  https://doi.org/10.1007/s11340-019-00530-2
  • O’Donoughue P., Robin O., Berry A., Time-space identification of mechanical impacts and distributed random excitations on plates and membranes, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science vol. 233, n°18, pp. 6436-644, 2019. http://dx.doi.org/10.1177/0954406219839094
  • Xavier J., Pierron F., Measuring orthotropic bending stiffness components of P. pinaster by the virtual fields method, Journal of Strain Analysis for Engineering Design, vol. 53, n° 8, pp. 556-565, 2018. http://dx.doi.org/10.1177/0309324718791087
  • Devivier C., Pierron F., Glynne-Jones P., Hill M., Time-resolved full-field imaging of ultrasonic Lamb waves using deflectometry, Experimental Mechanics, vol. 56, n° 3, pp. 345-357, 2016. http://dx.doi.org/10.1007/s11340-015-0099-9
  • Devivier C., Pierron F., Wisnom M.R., Damage detection in composite materials using deflectometry and the Virtual Fields Method, Composites Part A, vol. 48, pp.  201-218, 2013. http://dx.doi.org/10.1016/j.compositesa.2013.01.011
  • Xavier J., Belini U., Pierron F., Morais J., Lousada J., Tomazello M., Characterisation of bending stiffness of MDF from full-field slope measurements, Wood Science and Technology, vol. 47, pp. 423-441, 2013. http://dx.doi.org/10.1007/s00226-012-0507-6
  • Devivier C., Pierron F., Wisnom M.R., Damage detection in composite materials using deflectometry, a full-field slope measurement technique, Composites Part A, vol. 43, pp. 1650-1666, 2012. http://dx.doi.org/10.1016/j.compositesa.2011.11.009
  • Giraudeau A., Pierron F., Guo B., An alternative to modal analysis for material stiffness and damping identification from vibrating plates, Journal of Sound and Vibration, vol. 329, n° 10, pp. 1653-1672, 2010. http://dx.doi.org/10.1016/j.jsv.2009.11.031
  • Kim J.H., Pierron F., Wisnom M., Avril S., Local stiffness reduction in impacted composite plates from full-field measurements, Composites Part A, vol. 40, n°12, pp. 1961-1974, 2009. http://dx.doi.org/10.1016/j.compositesa.2009.09.024
  • Kim J.-H., Pierron F., Wisnom M., Syed-Muhamad K., Identification of the local stiffness reduction of a damaged composite plate using the virtual fields method, Composites Part A: Applied Science and Manufacturing, vol. 38, n° 9, pp. 2065-2075, 2007. http://dx.doi.org/10.1016/j.compositesa.2007.04.006