Vibration and Strain Analysis by Means of Holography: A method of taking holography out of the laboratory for routine use in stress and vibration component analysis problems

CURRENT methods for the analysis of stress and mode of vibration of blades, discs and small components are briefly reviewed. Alternative methods using holography are described and compared with conventional methods in terms of yield of information and ease of operation. Finally apparatus is described which will take holograms of objects up to two feet in diameter and may be operated by non‐specialist staff.