3 December 2014 Double-pulse digital speckle pattern interferometry for vibration analysis
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The double-pulse Digital Speckle Pattern Interferometry (DSPI) in the laboratory is established. Two good performances have been achieved at the same time, which is uniform distribution of laser beam energy by space filter and recording two successive pictures by a CCD camera successfully. Then two-dimensional discrete orthogonal wavelet transform method is used for the process of filtering method. By using the DSPI, speckle pattern of a vibrated object is obtained with interval of (2~800)μs, and 3D plot of the transient vibration is achieved. Moreover, good agreements of the mode shapes and displacement are obtained by comparing with Laser Doppler Vibrometer (LDV) .
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Dazhi Zhang, Dazhi Zhang, Jingfeng Xue, Jingfeng Xue, Lu Chen, Lu Chen, Juying Wen, Juying Wen, Jingjing Wang, Jingjing Wang, "Double-pulse digital speckle pattern interferometry for vibration analysis ", Proc. SPIE 9297, International Symposium on Optoelectronic Technology and Application 2014: Laser and Optical Measurement Technology; and Fiber Optic Sensors, 92971W (3 December 2014); doi: 10.1117/12.2073094; https://doi.org/10.1117/12.2073094

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