On the holographic interferometry fringe gradient method for complete surface deformation measurements

A fringe gradient method for complete surface gradient deformation measurements using five holograms is presented. Feasibility of the method is studied by combining the experimental results with the computer simulations. It is shown that the goveming equations relating the fringe gradient to the displacement vector and the displacement gradient are not well conditioned. Accuracy of the experimental data required to make the method successful is analyzed.