Conditions and examinations of vibration analysis of rotating blades with the help of holographic interferometry

Holographic vibration analyses of rotating objects are described, with attention given to techniques which involve use of a rotating hologram or a stationary hologram. The rotating-hologram technique employs a holographic system totally invariant with respect to object rotation; in this scheme, holographic interferometry of the complete object surface is possible. The stationary-hologram method is improved by use of double-pulse and stroboscopic illumination to suppress fringe patterns caused by object rotation.