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Quantitative vibration analysis using a single fringe pattern in time-average speckle interferometry

机译:在时间平均散斑干涉法中使用单个条纹图案进行定量振动分析

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In this paper, a novel technique for quantitative vibration analysis using time-average electronic speckle pattern interferometry is proposed. An amplitude-varied time-average refreshing reference frame method is used to capture a fringe pattern with a better fringe contrast than the conventional reference frame technique. The recorded fringe patterns with improved contrast provide better mode shape visibility and are easier to process. A derivative-based regularized phase tracker model is used to retrieve vibration amplitudes from a single fringe pattern. The method does not require a phase shifter to obtain the mode shape or amplitude. The method provides unwrapped amplitude and amplitude derivatives maps directly, so a separate phase unwrapping process is not required. Experimental work is carried out using a circular aluminum plate test specimen and the results are compared with a finite element method modal analysis. Both experimental and numerical results show that the proposed method is robust and accurate. (C) 2016 Optical Society of America
机译:本文提出了一种使用时均电子散斑干涉法进行定量振动分析的新技术。使用幅度可变的时间平均刷新参考帧方法来捕获条纹图案,该条纹图案的条纹对比度比常规参考帧技术更好。记录的条纹图案具有改进的对比度,提供了更好的模式形状可见性,并且更易于处理。基于导数的正则化相位跟踪器模型用于从单个条纹图案中检索振动幅度。该方法不需要移相器来获得模式形状或幅度。该方法直接提供展开的幅度和幅度导数图,因此不需要单独的相位展开过程。使用圆形铝板试样进行实验工作,并将结果与​​有限元方法模态分析进行比较。实验和数值结果均表明该方法是鲁棒的和准确的。 (C)2016美国眼镜学会

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