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Simultaneous measurement of shape and deformation using digital light-in-flight recording by holography

机译：通过全息技术同时测量形状和变形，使用数字飞行光记录

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摘要

A method for direct simultaneous measurement of shape and deformation using short laser light pulses and digital holography with a CCD array is demonstrated. This method can be used to study a rapid deformation cycle, to combine holographic interferometry with finite element analyze (FEA) modeling, and in other applications where information on both shape and displacement is of interest. Small displacements are measured with holographic interferometry, and larger displacements by comparing the shapes before and after a displacement, An in-line setup for light-in-flight recording by holography is used, where the reference beam is retroreflected from a blazed reflection grating, i.e., a Littrow setup. By this a relatively large optical delay is created across the CCD array between the reference and the object beams even with a small object-reference angle, which is necessary due to the limited resolution of the CCD array. Theory and selected experimental results are presented for deformations evaluated with holographic interferometry. (C) 2000 Society of Photo-Optical Instrumentation Engineers. S0091-3286(00)03301-8. References: 21
机译：演示了一种利用短激光脉冲和CCD阵列数字全息直接同时测量形状和变形的方法。该方法可用于研究快速变形周期，将全息干涉测量与有限元分析（FEA）建模相结合，以及用于其他对形状和位移信息感兴趣的应用。小位移用全息干涉测量法测量，较大的位移通过比较位移前后的形状来测量，使用全息术进行飞行中光记录的在线设置，其中参考光束从炽热的反射光栅逆向反射，即 Littrow 设置。这样，即使物体参考角很小，在参考光束和物体光束之间的CCD阵列上也会产生相对较大的光学延迟，这是必要的，因为CCD阵列的分辨率有限。给出了用全息干涉测量法评估变形的理论和选定的实验结果。（c） 2000年光电仪器工程师学会。[S0091-3286（00）：03301-8].[参考文献： 21]

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