A Shearograph for Nondestructive Testing of Products Obtained by Additive Technologies

Abstract

The results of measuring the deformation of products manufactured by methods of additive technologies are presented. The process of searching for and determining subsurface delamination and inconsistency defects by a contactless optical method based on shearography is shown. This method works on the principles of interferometry and holography. The slightest displacement of the surface can be measured with it with an accuracy on the order of the wavelength of light. A calibration device that reproduced the surface deformation was used to adjust the shearograph. The results of experimental studies show high sensitivity to small deformations of products, which is approximately 0.2 µm.