Abstract
A new method of holographic interferometry is proposed for obtaining the contours of the vibration amplitude and determining the phase of the vibration of an object. The basic idea is to make a double exposure hologram by the time average and the sinusoidal phase modulation methods. The brightest interference fringe on the reconstructed image corresponds to a nodal line and the second brightest fringe gives the information on the relative phases of vibration between various object points. The new method has been applied to a practical vibration study of the blade group of a steam turbine and its usefulness and simplicity have been verified.
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