基于成像的表面位移分析系统关键技术研究及应用

Research and Application of Key Techniques of Surface Displacement Analysis System Based on Imaging

非接触式表面位移测量是一种无损测量技术,在诸多工程领域有着广泛的用途。针对混凝土应力应变测试和河道瞬时全流场测量的应用,详细地描述了数字散斑测量和粒子成像测速这2个典型的基于成像的表面位移分析系统的研发,指出了具有共性的一些关键技术和难点,并提供了对应的解决方法。试验结果证明了本方法的有效性。然而,该方法仍存在较多技术缺失,包括多视角CCD相机的三维测速、多目标全轨迹追踪、不同场景测量数据高精度融合等,需要进行进一步研究。

Non-contact surface displacement measurement,as a nondestructive measurement technology,has been widely used in many engineering fields. For concrete＇s stress and strain testing and river channel＇s instantaneous flow field measurement,we developed non-contact surface displacement measurement systems based on digital speckle correlation method and particle image velocimetry. Some key issues in the developed systems are discussed and the corresponding treatments are given. The experimental result proves the effectiveness of the proposed method.Nevertheless,there are still some technical defectives to be furthered researched,including 3-D velocimetry of multi-perspective CCD camera,multi-purpose line tracing,and highly-precise fusion of measurement data of different scenes.