| 基于单幅数字散斑投影及图像相关的离面振动测量 |
| |
| 引用本文： | 杨福俊,房亮,何小元. 基于单幅数字散斑投影及图像相关的离面振动测量[J]. 光学技术, 2007, 33(3): 323-326 |
| |
| 作者姓名： | 杨福俊 房亮 何小元 |
| |
| 作者单位： | 东南大学,工程力学系,南京,210096;东南大学,工程力学系,南京,210096;东南大学,工程力学系,南京,210096 |
| |
| 摘 要： | 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。
|
| 关 键 词： | 数字散斑投影 时间序列数字图像相关 离面变形 振动分析 |
| 文章编号： | 1002-1582(2007)03-0323-04 |
| 收稿时间： | 2006-04-27 |
| 修稿时间： | 2006-04-27 |
Vibration measurement based on speckle projection and digital image correlation methods |
| |
| YANG Fu-jun,FANG Liang,HE Xiao-yuan. Vibration measurement based on speckle projection and digital image correlation methods[J]. Optical Technique, 2007, 33(3): 323-326 |
| |
| Authors: | YANG Fu-jun FANG Liang HE Xiao-yuan |
| |
| Abstract: | 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. |
| |
| Keywords: | digital speckle projection temporal sequence digital image correlation out-of-plane displacement measurement vibration analysis |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
