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Please use this identifier to cite or link to this item: http://eprint.iitd.ac.in/handle/2074/1330

Title: Measurement of out-of-plane static and dynamic deformations by processing digital speckle pattern interferometry fringes using wavelet transform
Authors: Rajesh Kumar
Singh, I P
Shakher, Chandra
Keywords: Digital speckle pattern interferometry (DSPI)
Deformations
Signal-to-noise ratio (SNR)
Histogram equalization
Symlet wavelet
Issue Date: 2004
Citation: Optics and Lasers in Engineering, 41(1), 81-93
Abstract: In this paper, we are presenting measurement of static and dynamic deformations in rectangular plate fixed at one end using digital speckle pattern interferometry (DSPI). To improve the measurement accuracy, we have developed a new filtering scheme based on combination of average/median filtering and Symlet wavelet filtering which enhances the signal-to-noise ratio (SNR) in the speckle interferogram obtained from DSPI. Experimental results show that our filtering scheme is quite effective in improving SNR of the speckle interferogram. The measurements by DSPI and calculations from beam theory in the case of out-of-plane static deformation and the measurements by DSPI and accelerometer in the case of dynamic deformation are in good agreement.
URI: http://eprint.iitd.ac.in/dspace/handle/2074/1330
Appears in Collections:Instrument Design Development Centre [IDDC]

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