“…Among them are time-averaged shadow-moire´method [1][2][3][4][5][6][7], classical interferometry [8][9][10][11], spatial filtering, holographic interferometric methods [12][13][14][15], laser speckle techniques [16], electronic speckle pattern interferometry [17,18], Talbot interferometry [19,20] and lateral shearing interferometry [21,22]. Most of these methods provide a vibration node map of a vibrating object.…”