IR4TD researchers are capable of doing holographic interferometry. In double-exposure holographic interferometry an interference pattern between two reconstructed images of the same object. A holographic recording is first made with the object in some reference state. The object is then moved or deformed as desired, and a second hologram is made on the same photographic film. During reconstruction two waves are created and interfere in the space beyond the hologram. The resulting interference fringes record the local displacement of the surface of the object.
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