Rapid visualization of displacement fields with the method of electronic speckle interferometry

The ESPI method produces an intereference picture without a need to reconstruct wavefronts, by means of simple subtraction by pixel of two registered digital holograms.

1. Static loading in the center of a plate with three-point bearing

Digital hologram	Correlational speckle interferogram

2. Oscillations of a disk fixed in the center, on a resonance frequency of 128 Hz

Digital hologram	Correlation speckle interferogram