High speed speckle interferometry for experimental analysis of dynamic phenomena

In this paper we present a high speed speckle interferometry system for the experimental analysis of transient and dynamic phenomena. The system is based on an out-of-plane continuous wave speckle interferometry setup and integrates a fast camera that allows acquisition rates of over 26,000 frames/s in a reduced window (160×60 pixels). We obtain thus series of temporally sampled, full spatial data fields of surface deformation during a given time interval. The data processing algorithms may concern 2D data fields or one-dimensional temporal histories of individual pixels.

► High-speed speckle interferometry measurements of dynamic deformation. ► Characterization of damped and multi-frequency vibrations. ► 4-step phase stepped data processed with 1-, 2- and 4-step algorithms. ► Two-dimensional and pixelwise data processing.