Automatic Vibration Mode Analysis with ESPI

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The determination of the modal parameters is one of the most difficult and time-consuming tasks in experimental component testing. Particularly, components that require full-field information about the modal behaviour require time consuming and complicated measuring procedures. In order to improve this situation, an automatic modal analysis system has been developed based on the full-field speckle interferometry measuring technique.

Electronic speckle pattern interferometry (ESPI) can be used for non-contact, full-field, three-dimensional measurement of static or dynamic deformations of components. The component to be analyzed is illuminated with a laser and the image recorded with a camera. The comparison of two images, taken at two different times, provides a map of full field deformation between the two states of the object.

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