Digital speckle pattern interferometry (DSPI): a fast procedure to detect and measure vibration mode shapes

Pierre R. Slangen; Leon Berwart; Christophe De Veuster; Jean-Claude Golinval; Yves F. Lion

doi:10.1117/12.185317

8 September 1994 Digital speckle pattern interferometry (DSPI): a fast procedure to detect and measure vibration mode shapes

Pierre R. Slangen, Leon Berwart, Christophe De Veuster, Jean-Claude Golinval, Yves F. Lion

Author Affiliations +

Proceedings Volume 2358, First International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1994) https://doi.org/10.1117/12.185317
Event: Vibration Measurements by Laser Techniques: First International Conference, 1994, Ancona, Italy

Abstract

Digital Speckle Pattern Interferometry (DSPI) is a non destructive testing optical method allowing the visualization of the defects of the deformations of an object submitted to static deformation or to vibration. This method can be applied to a lot of cases within a range of displacements between tens of nanometers and tens of micrometers. DSPI can be applied to detect the natural frequencies and to visualize the mode shapes of a vibrating object. It is very convenient to study small and weak objects because no contact is required comparing the classical modal analysis using accelerometers. DSPI was successfully applied to study a cantilever aluminum plate (5 cm X 10 cm X 1 mm). The experimental iso-displacement fringe maps are compared to computational results using a finite element method.

Citation Download Citation

Pierre R. Slangen, Leon Berwart, Christophe De Veuster, Jean-Claude Golinval, and Yves F. Lion "Digital speckle pattern interferometry (DSPI): a fast procedure to detect and measure vibration mode shapes", Proc. SPIE 2358, First International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (8 September 1994); https://doi.org/10.1117/12.185317

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