Kenneth Olofsson

TL;DR: In this article, material parameters in an anisotropic plate are determined using two non-destructive measuring techniques: real-time phase-stepped electronic speckle pattern interferometry and dual-reference-beam pulsed holographic interFERometry.

TL;DR: In this paper, a conical mirror is placed axially inside a tube of steel and in a ring of aluminum to study bending waves generated by the impact of a ballistic pendulum.

Abstract: We have presented a method to generate bending waves in a plate by focusing a Q-switched Nd:YAG-laser pulse on its surface. These waves are recorded by double pulsed hologram interferometry. Evaluation of the interferograms show that the bending wave pattern is very similar to what is predicted by the Kirchhoff plate equation assuming a point impact of infinitesimally short duration. This indicates that a short Nd:YAG-laser pulse may be considered as a Dirac pulse in space and time. Future investigations will be performed with a more powerful and “cleaner” laser to get a higher energy and impulse transfer to the plate thus giving bending waves of larger amplitude. Promising preliminary experiments have also begun using a double pulsed ruby laser both for generating and recording of bending waves.

TL;DR: In this article, a mesure de rigidite du papier is proposed, based on the moyen de l'interferometrie holographique, and a methode proposee peut etre developpee sous forme d'appareil de mesure sur machine de type industriel.

TL;DR: In this article, a short laser pulse from a 1 J ruby laser is focused at a steel plate, and the effect will be that the material surface at the impact point becomes very rapidly heated.