The implementation of structural health monitoring systems in modern aircraft structures requires a deeper understanding
of impact and piezoelectric generated lamb wave propagation on carbon fibre reinforced plastics. In this paper a digital
shearing interferometry method is presented that visualizes lamb waves excited by impact events or piezoelectric
actuators. The contactless full field measurement of these waves is realized by a Mach-Zehnder interferometer which
combines spatial phase shifting and Shearography. The latter is a laser based technique whereby the first order derivates
of the displacement is indicated. Since a dynamical process is observed the spatial phase shifting technique is required.
The optical implementation of both techniques within the interferometically setup and experimental results with the
possibility to measure the out of plane displacement are presented. Therefore the underlying wavefield is reconstructed
from the measured first order derivatives. Subsequently these results are compared with a one point measuring method
and FEM simulation.