Abstract
The vibratory patterns of a circular plate were studied systematically by means of real-time holography and also by time-averaged holography. The present real-time method, an extension of the original method of Stetson and Powell (1965), allows one to view reconstructions of vibratory patterns directly and observe their changes as the frequency and/or amplitude of the signal are being varied. The contrast obtained is much poorer than that given by the time-averaged method. Nevertheless, the real-time method permits one to pinpoint specific mode patterns for later recording by time-averaged holography. In a given situation, time-averaged holography records approximately twice as many alternate bright and dark fringes as the real-time method.
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