THE INFLUENCE OF PIEZO-ELECTRIC TRANSDUCER DISPLACEMENT ERROR ON DEFECT DETECTION IN DIGITAL SHEAROGRAPHY SPECKLE PATTERN INTERFEROMETRY

© 2017    Y. G. Zhan*, Associate Professor of Optical Engineering; H. Y. Zhang*, graduate student; X. C. Ye*, graduate student; Y. Z. Zhou*, graduate student; Z. S. Qiu*, graduate student; F. Yang*^,**, Associate Professor of Optical Engineering; P. Zhong*, Professor of Optical Engineering; M. Jiang*, Associate Professor of Optical Engineering; H.Y. Zhou*, Assistant Professor of Optical Engineering

*   Donghua University, Shanghai, P.R.China

** University of Colorado Boulder, Boulder, Colorado, U.S.A

E-mail: fuyang@dhu.edu.cn

Submitted 31.03.2016

This paper focuses on the influence of Piezoelectric Transducer displacement error on the detection ability of Digital Shearography Speckle Pattern Interferometry. The estabilished model is based on the principle of shearography using the software of Ansys and Matlab. The simulation uses a circular thin aluminum plate with pressure exerted in the center as a model. The simulation conclusions show that when the loading intensity is large, the defect size is big, the defect location is near to the surface and close to loading, the influence of Piezoelectric Transducer displacement error on defect detection is weak. Defects can be detected easily. Otherwise, the influence is great, which may hardly detect the defect. To the best of our knowledge, it’s the first published paper focuses on the influence of Piezoelectric Transducer displacement error on the detection ability of Digital Shearography Speckle Pattern Interferometry. The conclusions can provide some useful guidance to the actual experiment.

Keywords: DSSPI, temporal phase-shift, PZT displacement error, defect detection, SNR.

OCIS codes: 120.6160, 120.4290, 050.5080

© 2017 г.       Y. G. Zhan; H. Y. Zhang; X. C. Ye; Y. Z. Zhou; Z. S. Qiu; F. Yang; P. Zhong; M. Jiang; H.Y. Zhou

Анализиуется влияние ошибок перемещения пьезоэлектрического привода на способность обнаруживать дефекты методами цифровой сдвиговой спекл-интерферометрии. Развитая модель основана на принципах сдвиговой интерферометрии и использует программные пакеты Ansys и Matlab. В качестве модели использовалась алюминиевая пластина в виде круга, нагружаемая в центре. Моделирование показало, что когда величина нагрузки велика, размеры дефекта велики, он локализован вблизи поверхности и близок к точке нагружения, влияние ошибок перемещения пьезоэлектрического привода на способность обнаруживать дефект невелико, и последний легко обнаружим. В противоположных случаях, это влияние велико и дефект обнаружить трудно. Насколько нам известно, данная публикация является первой, в которой анализируется указанное влияние. В заключении приведены практические рекомендации, полезные при проведении реальных измерений.

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