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Speckle Pattern Interferometry of Vibration Modes

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2 Author(s)
Andrews, I.M. ; IBM United Kingdom Laboratory, Hursley, Winchester, England, UK ; Leendertz, J.A.

An optical facility is described for the study of the vibrational behavior of engineering test pieces. Time-average holography and electronic speckle pattern methods of analysis are combined into one system. The speckle pattern method is used for the identification of resonances, frequency tuning, and object alignment, thereby optimizing the number of holographic exposures. An evaluation is made of the electronic speckle pattern method for the detection of vibration modes of three-dimensional objects. The method is shown to detect resonant vibration readily on object faces inclined at angles up to 60° to the viewing direction.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Journal of Research and Development  (Volume:20 ,  Issue: 3 )