Séminaire: Pierre Margerit

Stroboscopic Imaging for the dynamical analysis of multiscale media

With the offered availability of low-cost programmable electronics, fast high-power LEDs, high-resolution cameras and image tracking algorithms, stroboscopic imaging can now be implemented very easily in order to study the experimental response of complex structures. Despite its neglectible cost compared to off-the-shelf dynamical full-field measurement setups (scanning laser vibrometry of high-speed imaging), this almost-forgotten two-centuries-old imaging technique opens the door for high-resolution high framerate analysis of structures with repeatable motion. 
Applications of the technique will be presented for the micro-macro analysis of the motion of periodic lattices that exhibit particularly exotic wave propagation characteristics. It will be shown that the rich experimental data obtained allows for the implementation of data-driven techniques associated to system identification and model order reduction.
 
Graphical Abstract: Experimental harmonic response of an auxetic honeycomb lattice with its associated wavevector spectrum