Time average triple-image holography for measuring vibration

A time-average triple-image holography technique is described. In the method, three linearly independent equal pattern element (EPE) plates are obtained on which the corresponding elements (called the address code) of a matrix expressing the plate represent the same point (X, Y, Z) on the specimen. The address codes are obtained using the theory of projection geometry. Data acquisition and processing are carried out automatically. The optical system diagram and the flow chart for processing the EPE plates are included.