Electronic speckle pattern shearing interferometry using photopolymer diffractive optical elements for vibration measurements

Emilia Mitkova Mihaylova; Izabela Naydenova; Suzanne Martin; Vincent Toal

doi:10.1117/12.579539

22 June 2004 Electronic speckle pattern shearing interferometry using photopolymer diffractive optical elements for vibration measurements

Emilia Mitkova Mihaylova, Izabela Naydenova, Suzanne Martin, Vincent Toal

Author Affiliations +

Proceedings Volume 5503, Sixth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (2004) https://doi.org/10.1117/12.579539
Event: Sixth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 2004, Ancona, Italy

Abstract

Electronic speckle pattern shearing interferometry (ESPSI) is superior to Electronic speckle pattern interferometry (ESPI) when strain distribution, arising from object deformation or vibration, need to be measured. This is because shearography provides data directly related to the spatial derivatives of the displacement. Further development of ESPSI systems could be beneficial for wider application to the measurement of mechanical characteristics of vibrating objects. Two electronic speckle pattern shearing interferometers (ESPSI) suitable for vibration measurements are presented. In both ESPSI systems photopolymer holographic gratings are used to shear the images and to control the size of the shear. The holographic gratings are recorded using an acrylamide-based photopolymer material. Since the polymerization process occurs during recording, the holograms are produced without any development or processing. The ESPSI systems with photopolymer holographic gratings are simple and compact. Introducing photopolymer holographic gratings in ESPSI gives the advantage of using high aperture optical elements at relatively low cost. It is demonstrated that both ESPSI system can be used for vibration measurements. The results obtained are promising for future applications of the systems for modal analysis.

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Emilia Mitkova Mihaylova, Izabela Naydenova, Suzanne Martin, and Vincent Toal "Electronic speckle pattern shearing interferometry using photopolymer diffractive optical elements for vibration measurements", Proc. SPIE 5503, Sixth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 June 2004); https://doi.org/10.1117/12.579539

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KEYWORDS

Holography

Interferometry

Diffraction gratings

Speckle pattern

Vibrometry

Aluminum

Modal analysis

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