一种新型动态三维外差散斑干涉测量技术的研究

项目名称： 一种新型动态三维外差散斑干涉测量技术的研究

项目编号： No.51275033

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 机械、仪表工业

项目作者： 高瞻

作者单位： 北京交通大学

项目金额： 80万元

中文摘要： )：由于散斑测量技术中最常用的时间相移法存在不能测量动态位移、测量范围小、不是真正意义上的实时测量、需要一套昂贵的PZT 设备等缺点，2000 年以来国际上提出了外差时域散斑测量技术。这种技术具有结构简单、测量范围大、可以测量动态变形、抗干扰能力强等优点，因而有着越来越广泛的应用。但目前这种技术尚存有缺点，具体表现在：外差装置产生部分有旋转部件，对测量精度的影响较大；测量范围仍需扩大；尚无可以同时测量三维形变的该种装置的报道。针对这些问题，本申请采用了新的外差产生方法，克服了原有方法中差频不稳定的缺点；同时，本申请将多波长测量技术引入了时域散斑测量技术中，有效的扩大了测量范围。另外提出了能同时测量物体三维动态变形的外差时域散斑装置的方案。该技术将在物体的位移、应变、无损探伤、振动测量等方面发挥较大作用。

中文关键词： 散斑干涉测量；外差法；三维测量；数字剪切散斑测量；

英文摘要： Electronic speckle pattern interferometry (ESPI) is a well established technique for measuring out-of-plane and in-plane displacement components, strains, slopes, curvatures, and vibrations of a diffusely scattering object. Thus, it is widely used in measurement for academic and industrial research, and inspection in areas such as experimental mechanics, vibrations analysis, and nondestructive evaluation. However, the traditional measurement of displacement needs two statues: before and after deformation. Hence temporal and continual deformation can not be measured. In addition, the measurement range of deformation is relatively small. Therefore a temporal speckle pattern interferometry (TSPI) was presented，which can obtain the whole-object deformation by using Fourier transform methods of the speckle pattern recorded in a sequence while the object is being deformed. To further expand the measuring range and to improve the anti-interference ability, heterodyne temporal speckle pattern interferometry (HTSPI) was presented, in which the carrier frequency was introduced. But there are still several problems existing, for example, there are rotating parts in HTPSI, which has seriously affected the measuring accuracy; The measuring range still needs to be expanded as well; There are no HTSPI which can measure 3D dis

英文关键词： Speckle inference measurement；Heterodyne method；Three dimension measurement；Digital shear speckle measurement；