Abstract

In this paper, mechanical experiments with a low-cost interferometry set-up are presented. The set-up is suitable for an undergraduate laboratory where optical equipment is absent. The arrangement consists of two planes of illumination, allowing the measurement of the two perpendicular in-plane displacement directions. An axial load was applied to three different metals, and the longitudinal and transversal displacements were measured sequentially. A digital camera was used to acquire the images of the different states of the load of the illuminated area. A personal computer was used to perform the digital subtraction of the images to obtain the fringe correlations, which are needed to calculate the displacements. Finally, Young’s modulus and Poisson’s ratio of the metals were calculated using the displacement data.

Highlights

  • Electronic Speckle Pattern Interferometry (ESPI) is a technique for full-field displacement measurement and has been well accepted in experimental mechanics field [1,2]

  • In this paper experiments for two in-plane measurements were performed using a digital camera as the medium of acquiring images and a diode laser as a coherent light source

  • The calculated values of these mechanical properties are compared with those reported on the reference [12]

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Summary

Introduction

Electronic Speckle Pattern Interferometry (ESPI) is a technique for full-field displacement measurement and has been well accepted in experimental mechanics field [1,2]. Experiments with low-cost devices such as a digital camera and a diode laser have been reported [4,5,6,7]. In order to measure the two perpendicular displacement directions with ESPI, it is necessary to develop a two in-plane measurement setup [8,9,10,11]. In this paper experiments for two in-plane measurements were performed using a digital camera as the medium of acquiring images and a diode laser as a coherent light source. The calculated values of these mechanical properties are compared with those reported on the reference [12]. Results obtained revealed that Young’s modulus and the Poisson’s ratio calculated are close to the reference values

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