HOLOGRAPHIC INTERFEROMETER FOR DETERMINATION OF RESIDUAL STRESS Russian patent published in 1994 - IPC

FIELD: measurement technology. SUBSTANCE: light from source of coherent emission gets into system of formation of illuminating beam which focuses beam into plane of positioning of photorefractive crystal thanks to presence of focusing lens at the output. Beam passed through crystal gets into system of formation of object beam where it expands and is guided to object. Beam reflected from object is focused on photorefractive crystal. As a result of interference of beams a hologram is recorded in crystal on which illuminating beam defracts reconstructing by that image of object. Depending on mode of operation either hologram or object in initial state is recorded in crystal and reconstructed beam interferes with beam reflected from object in real time or holograms of object in two states are recorded in crystal which are interfered with each other when reconstructed. EFFECT: increased volume of obtained information and avoidance of "wet" process of production of holograms. 5 cl, 5 dwg