采用单幅数字散斑图投影及高速数字图像采集技术，研究了动态离面位移的测量。采用商用液晶投影仪将计算机产生的模拟散斑图投影到待测动态变形物体表面，由高速数字图像采集设备摄取并保存变形散斑图，采用时间序列数字图像相关软件计算出物体表面各点随时间变化的离面位移。这种方法用于振动分析时不仅可以获得振型分布，而且还可以获得各点的振幅值。与现有的激光频闪照相测振及激光多普勒测振等方法相比，具有光学系统简单，可全场定量测量。悬臂梁振动实验结果证实了该方法的有效性。

The possibilities for vibration analysis using digital speckle projection together with digital image correlation method (DICM) were explored. A digital speckle pattern,generated by computer,was projected on an object surface using an LCD projector. Then the dynamic deformation modulated speckle images were captured by a high-speed CCD camera and saved in the computer. By using the self-developed temporal digital images correlation algorithm,the deformation and vibration mode were analyzed quantitatively. The proposed method avoids using stroboscopic or laser illumination and simplifies the experimental setup for vibration measurement,while it is time-consuming due to calculating a large amount of correlation coefficients. The experimental performance on a harmonic-vibrating cantilever beam well demonstrates the validity of the proposed method.