In this manuscript we present the development of an integrated shearography system that is able to measure the 3D deformation of an object surface. In order to determine all six displacement derivatives that may contribute to shearography results, six measurements with three different sensitivity directions and two shear directions have to be performed. The realized system is able to perform this measurement sequence in an automated way.
"Compact shearography system for the measurement of 3D deformation", Proc. SPIE 3745, Interferometry '99: Applications, (17 August 1999); doi: 10.1117/12.357771; https://doi.org/10.1117/12.357771