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Electronic speckle pattern interferometry deformation measurement on lightweight structures under thermal load

机译:电子散斑干涉测量在热负荷下轻质结构的变形测量

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We report on the application of ESPI to measure deformations induced by thermal load on lightweight honeycomb panels for space applications. The panel was mounted isostatically onto a vibration isolated table. A housing for temperature stabilisation was constructed enclosing the panel, heating elements, fans and the ESPI-head made of Invar. Emphasis is put on the quantitative analysis of the deformation of this large object (0.8×0.8mm~2) viewed from a relatively short distance of 1.1 m and illuminated sequentially from three non-orthogonal directions. Influences of laser stability, rigid body displacements, temperature inhomogeneities as well as possible deformations of the measurement head are discussed in order to derive the measurement uncertainty and to estimate corrections. Beside the sensitivity vector analysis it is important to take into account the optical light path changes due to temperature changes. Out-of-plane deformation fields of the panel are presented.
机译:我们报告了ESPI在测量用于空间应用的轻质蜂窝板上的热载荷引起的变形方面的应用。将板等静地安装在隔振台上。构造了一个用于温度稳定的外壳,包围了面板,加热元件,风扇和由Invar制成的ESPI喷头。从1.1 m的相对较短距离观察并从三个非正交方向依次照亮该大对象(0.8×0.8mm〜2)的变形,重点是对其进行定量分析。讨论了激光稳定性,刚体位移,温度不均匀性以及测量头可能变形的影响,以得出测量不确定度并估计校正量。除了灵敏度矢量分析外,重要的是还要考虑由于温度变化引起的光路变化。显示了面板的平面外变形场。

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