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Proceedings Paper

Vibration mode shape visualization with dual function DSPI system
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Paper Abstract

Digital speckle pattern interferometry (DSPI) and digital shearography (DS) are full field, non-contact optical methods for deformation or its derivative measurement. These techniques are also well suited for the measurement of vibrations. For the present work we use a dual-function DSPI system for the visualization of resonance frequencies and their mode shapes. The system is convenient and also efficient to switch over from an out-of-plane sensitive configuration to shearography. A time-average technique using a refreshing reference frame used for better visualization of the modes. The technique suppresses ambient disturbances such as thermal noise and low freq. noise, etc so that measurement can be performed under harsh environmental condition. Vibration mode shapes are investigated for objects vibrating sinusoidally at different resonant frequencies, for both out-of-plane and shearography configurations.

Paper Details

Date Published: 14 August 2006
PDF: 7 pages
Proc. SPIE 6292, Interferometry XIII: Techniques and Analysis, 629217 (14 August 2006); doi: 10.1117/12.680042
Show Author Affiliations
Basanta Bhaduri, Indian Institute of Technology Madras (India)
M. P. Kothiyal, Indian Institute of Technology Madras (India)
N. Krishna Mohan, Indian Institute of Technology Madras (India)


Published in SPIE Proceedings Vol. 6292:
Interferometry XIII: Techniques and Analysis
Katherine Creath; Joanna Schmit, Editor(s)

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