Vibratory patterns examined by real‐time and time‐averaged holography
作者:
S. M. Khanna,
J. Tonndorf,
I. Janecka,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1973)
卷期:
Volume 54,
issue 6
页码: 1686-1693
ISSN:0001-4966
年代: 1973
DOI:10.1121/1.1914468
出版商: Acoustical Society of America
数据来源: AIP
摘要:
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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