Application of Holographic Interferometry to Mechanical Experiments

TLDR: In this paper, some new attempts are made mainly for bending experiments where the measurement of deflection is a fundamental task, such as determining Poisson's ratio of plate and analysis of moments in bending slab.

Abstract: One of the merits of holographic interferometry (1,2) is that distinct interference fringes appear even on a rough surface. The use of interferometry is not restricted only to an object with specularly reflecting surfaces. Another merit is the capability of time shearing interferometry. A wave front from an object can be compared not with any reference wave front but with that of the object itself in different states. Such advantages make the interferometric method applicable extensively to engineering problems. Moreover, the interferometry enables us to measure essentially the longitudinal displacement more easily than the lateral one. In the present paper, some new attempts are made mainly for bending experiments where the measurement of deflection is a fundamental task. The following three experiments ----- the first two are static and the third dynamic ----- are carried out; 1) Determination of Poisson’s ratio of plate; 2) Analysis of moments in bending slab; 3) Flexural vibration of plate. Further the following experiment is supplemented; 4) Analysis of moving object.