Abstract

A method was developed for analyzing modes and amplitudes of vibration of a randomly excited object. Time-average holography, in which the reference beam was mechanically excited at any given frequency in the spectral range of the random excitation, was applied. The phase of the exciting vibration of the reference beam was locked to the phase of the specific frequency in the random band. This method was applied as successfully as for objects excited with swept sinusoidal vibration.

© 1990 Optical Society of America

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