Lopes, HernaniGuedes, Rui M.Vaz, M.A.P.2011-05-242011-05-242006Lopes, H. (2006). An improved sherography technique for spatial differentiation. In 5th International Conference of Mechanical & Materials in Design. Porto, Portugal. ISBN 972-8826-11-7972-8826-11-7http://hdl.handle.net/10198/4505In this work we describe a new device designed to obtain a high quality experimental measurement with shearography. With this setup the spatial differentiation, up to the third order of out-of-plane displacements can be directly obtained. A compact setup with a high resolution camera was developed to capture the spatial derivatives. The quantitative measurements are obtained from the phase maps computed with four images phase shift technique. Good quality measurements of the higher order spatial differentiation were obtained by optical and digital means without the need of advance post processing. The border problem is also discussed and the results up to the third order are compared with the analytical solution.engShearography techniqueSpatial high order derivativesconference object