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Speckle interferometry: three-dimensional deformation field measurement with a single interferogram

机译:散斑干涉测量法:利用单个干涉图测量三维变形场

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An electronic speckle interferometer, arranged for out-of-plane sensitivity and with an off-axis reference beam to produce spatial phase bias, is used for three-dimensional deformation field measurements. The complex amplitude of the object wave is calculated by application of a Fourier-transform method to a single interferogram. The change in phase after object deformation yields the out-of-plane component of the displacement field. The two in-plane components are obtained by cross correlation of subimages of the reconstructed object wave's intensity, a method that is also referred to as digital speckle photography. The Fourier-transform algorithm is extended and modified, leading to random measurement errors that are below widely accepted theoretical limits and also to an extended measuring range. These properties and the mutually combined information improve the accuracy of both methods compared with their usual single implementation. The performance is evaluated in experiments with pure out-of-plane, pure in-plane, and combined deformations and compared with theoretical values. An example of a practical application is given.
机译:一种电子散斑干涉仪,用于平面外灵敏度,并带有离轴参考光束以产生空间相位偏置,用于三维形变场测量。通过将傅立叶变换方法应用于单个干涉图来计算物波的复振幅。物体变形后的相位变化产生位移场的平面外分量。这两个面内分量是通过重建物波强度的子图像的互相关获得的,该方法也称为数字散斑摄影。傅立叶变换算法得到扩展和修改,从而导致随机测量误差低于广泛接受的理论极限,并导致测量范围扩大。与通常的单个实现相比,这些属性和相互组合的信息提高了这两种方法的准确性。在纯平面外,纯平面内和组合变形的实验中评估了性能,并与理论值进行了比较。给出了实际应用的例子。

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