Effect of defects to eigenmodes of a paper

In this research paper the effects of defects to the eigenmodes of a sheet of paper are determined. By using the procedure of experimental investigations on the basis of the method of projection moire the eigenmodes of the standing waves of the paper excited by vibrations were determined for the paper with defects and without them. The proposed method of optical diagnostics of defects is applicable in the systems of automatic control of packaging materialsKauno technologijos universitetasVytauto Didžiojo universiteta