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利用激光双光束散斑干涉并引入相移技术,对复合混凝土加固件进行全场位移、应变实验测量。借助于图像处理技术,通过分析散斑干涉条纹图可以得到加固件在不同荷载作用下的位移、应变分布,从而实现对采用不同规格、材料参数时的加固性能进行评估分析。实验表明,相移散斑干涉技术不仅可以实现高精度的位移测量,通过对位移场进行数值拟合求导得到的应变同样具有很高的精度。文中对实验方法进行了较详细的讨论,并对典型试件的图像处理过程进行说明。相关技术可以作为类似工程的有益参考。
By using laser double-beam speckle interference and introducing phase-shift technique, the full-scale displacement and strain measurements of composite concrete reinforcements were carried out. With the help of image processing technology, the displacement and strain distribution of stiffener under different loads can be obtained by analyzing the speckle fringe pattern, so as to evaluate and evaluate the reinforcement performance when using different specifications and material parameters. Experiments show that the phase-shift speckle interferometry can not only achieve high-precision displacement measurement, but also obtain high strain accuracy through the numerical fitting of the displacement field. In this paper, the experimental method is discussed in more detail, and the image processing of the typical specimen is described. The related technology can be used as a useful reference for similar projects.