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Two independent coherent radiation sources with wave length of 632.8nm are simultaneously used in speckle interferometer optical arrangement with combined beams and speckle-modulated background wave. This permitted to reduce low-frequency noise related to non-uniform light pattern of the surface of the object under investigation. Moreover, measurements performed showed speckle-noise dispersion reduction. The developed method application allows increasing of interference fringes visibility in speckle-interferograms that is required to increase measurement accuracy of vibration and static displacement orthogonal to the surface of the part under investigation

Use of Two Radiation Sources in Speckle Interferometer Optical Arrangement at Turbo-Machine Parts Deformation and Vibration Investigation