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

Pierre Slangen (1) , Leon Berwart (1) , Christophe de Veuster (1) , Jean-Claude Golinval (1) , Yves Lion (1)

1 Université de Liège

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.

Domaines: Physique [physics]

Pierre Slangen, Leon Berwart, Christophe de Veuster, Jean-Claude Golinval, Yves Lion. Digital speckle pattern interferometry (DSPI): a fast procedure to detect and measure vibration mode shapes. Vibration Measurements by Laser Techniques: First International Conference, Sep 1994, Ancona, Italy. pp.102-110, ⟨10.1117/12.185317⟩. ⟨hal-02299442⟩