Optical full-field techniques for vibration deformation measurements Seminar

Camera-based deformation measurements (CBDMs) are spreading fast in the field of material and structural testing. Techniques like Digital Image Correlation (DIC) are now commercially available (see for instance www.matchid.eu) and gradually, new test protocols are established to take advantage of the tens or hundreds of thousands of data points obtained each time images are captured. However, this technology has not been as readily adopted in the community of structural vibrations. One of the reasons is the fact that the deformations are generally small and DIC can sometimes struggle to deliver enough sensitivity, the other is that high-speed cameras have long been too limited in performance or too expensive to make this technology feasible for structural vibration measurements. Maybe a third factor was the focus of the structural vibration community on time/frequency rather than space and this new technology challenges the established testing techniques.

With the spectacular progress of high speed cameras both in terms of performance and affordability (visit for instance ultra-high-speed-camera), CBDMs are gradually starting to penetrate the community of structural vibrations but this is still a budding field. The objective of this talk is to use my long experience of CBDMs to present the existing state of the art in this field, and to examine future potential. The presentation will include examples of an underrated technique called deflectometry, already presented at the last NOVEM conference; the presentation can be consulted ahead of the seminar on www.camfit.fr for attendants prepared to do a bit of homework before the talk.