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Proceedings Paper

Whole field out-of-plane vibration analysis with a HOE-based ESPI system
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Paper Abstract

Electronic speckle pattern interferometry (ESPI) is a full-field measurement technique, capable of displaying vibrational mode shapes. A simple optical set-up for an ESPI system using a holographic optical element (HOE) is presented. The HOE is designed to create a speckled reference beam in the interferometer. A partially reflective glass plate provides illumination of the object along the normal to its surface, ensuring that the system is sensitive only to out-of-plane displacement of the object. It is demonstrated that the HOE-based system can be used for vibration measurements. Phase shifting can be implemented for fringe analysis. A big advantage of the system is its simplicity. It requires a small number of components: a coherent light source, a holographic optical element, a glass plate and a CCD camera. Introducing holographic optical elements in ESPI gives the advantage of large aperture optical elements at relatively low cost.

Paper Details

Date Published: 17 June 2008
PDF: 4 pages
Proc. SPIE 7098, Eighth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 70980M (17 June 2008); doi: 10.1117/12.803004
Show Author Affiliations
Emilia Mihaylova, Dublin Institute of Technology (Ireland)
Viswanath Bavigadda, Dublin Institute of Technology (Ireland)
Raghavendra Jallapuram, Dublin Institute of Technology (Ireland)
Vincent Toal, Dublin Institute of Technology (Ireland)

Published in SPIE Proceedings Vol. 7098:
Eighth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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