Abstract

A means is demonstrated for determining the phase of vibrating objects by using either time average holography or real time holographic interferometry. The technique consists of vibrating a mirror in either the object or reference leg at the same frequency as the object and observing the effects on the fringe pattern when either the phase or amplitude of the mirror vibration is altered. Proper adjustment of these parameters places an interferometric node (fringe-contrast maximum) at any object point. The phase is then known from the phase of the vibrating mirror.

© 1970 Optical Society of America

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