Speckle interferometry

Speckle interferometry is an imagery technique using laser light and displaying and quantifying movements at the surface of an object between two different states. It is used in the laboratory and on site.

By carrying out acquisitions at a regular rate (for instance several Hz). It is possible to monitor very accurately object deformations over long periods of time (several days). The total measured amplitudes can then achieve several hundreds of microns.

Example : From a movement field, we can quickly obtain deformations and mechanical stresses at the surface of a flat part.