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Title: Identification of antinodes and zero-surface-strain contours of flexural vibration with time-averaged speckle pattern shearing interferometry
Authors: Wong, WO 
Chan, TK
Leung, TP
Issue Date: 1-Jun-1997
Source: Applied optics, 1 June 1997, v. 36, no. 16, p. 3776-3784
Abstract: A new time-averaged frame subtraction technique is introduced for vibration analysis by digital speckle shearing interferometry. The technique permits the enhancement of fringes by subtracting two Bessel fringe patterns at different forcing levels. Compared with the phase-shift method, this method is more efficient and easier to implement for qualitative vibration measurement, providing a means for fast inspection of plate vibration behavior. It is also capable of tracing contours of zero strain and locating antinodes on vibrating plates.
Keywords: Antinodes
Digital shearography
Time-average speckle pattern shearing interferometry
Vibration mode shape
Zero-strain distribution
Publisher: Optical Society of America
Journal: Applied optics 
ISSN: 0003-6935
DOI: 10.1364/AO.36.003776
Rights: © 1997 Optical Society of America. This paper was published in Applied Optics and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-36-16-3776. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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