基于双目立体视觉与数字散斑图像相关的全场振动测量

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Abstract The paper studies the three dimensional full-field vibration measurement related problems based on the 3D digital speckle correlation method(3D-DSCM). In this method, binocular high-speed cameras continuous collect speckle dynamic deformation images, matching of target points combined with digital speckle correlation method, the out-of-plant vibration displacement information changes over time can be obtained. In this paper, through the experimental study by comparison experiment of the steady-state responses of sine excitation and the parameters (correlation function, area size and shape function) choose influence on measurement results. The results show that relative error of vibration amplitude measured 50hz steady state incentives is less than 3.5%, the amplitude-frequency curve correlation coefficient is higher than 98%;Correlation function, area size, shape functions have great influence on accuracy of calculation.

Key words： digital speckle image correlation full-field vibration correlation function area size shape functions

Received: 14 August 2014 Published: 15 July 2015

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2015/V34/I13/121

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