Interferometric Vibration Analysis by Wavefront Reconstruction

Abstract

A study of the Leith–Upatnieks hologram for the time average of the coherent wavefronts scattered from a vibrating object is reported. The image reconstructed by the hologram is found to contain a system of interference fringes which map contours of constant vibration amplitude, thus providing a method of analysis of the vibration of objects with arbitrary surfaces. Experimental results are presented and interpreted for a simple periodic vibration; statistical motion of objects is discussed.