Optics and Photonics Society of Iran

In this paper a new optical speckle shearography setup to measure the two dimensional strain map in materials is introduced. This setup is based on the speckle shearography using a Michelson interferometer, but uses a divergent coherent laser beam and an innovated optical arrangement to expand the field of view and form the speckle images. Compared to other similar setups, our setup requires fewer optical components, is more robust against unwanted vibrations, and is easier to be aligned. To demonstrate the capabilities of our setup, two dimensional map of the out of plane component of the strain field in a metallic sample plate under dynamic load has been measured and presented.