激光技术2016，Vol.40Issue(6)：801-805,5.DOI:10.7510/jgjs.issn.1001-3806.2016.06.006
基于散斑图像的远程振动频率提取方法研究
Research on the technique of vibration frequency remote detection based on speckle pattern
摘要
Abstract
In order to obtain the frequency information of remote object’ s micron vibration, the remote detection technique of micro vibration information bases on laser speckle interferometer was used. The CW laser of 532nm wavelength was used as light source to light the to-be-detected object surface 50m away. A high speed camera was used as speckle image acquisition system. At first, telephoto lens was used to do the appropriate defocus processing of remote speckle image. Then, the changing information of speckle was obtained from the vector size between the peak value of correlation and the origin point. At the same time, the vibration frequency information in a certain wide frequency range was extracted. The results show that, extraction accuracy of remote micro vibration frequency by laser speckle is up to 99. 22%. The study can provide some argumentation basis for acoustic vibration based on laser speckle.关键词
激光光学/激光散斑/振动频率远程探测/散焦/互相关系数Key words
laser optics/laser speckle/vibration frequency remote detection/defocus/correlation coefficient分类
信息技术与安全科学引用本文复制引用
石焕,朱弘,肖容,吴炬,张秋霞,钱荣欣..基于散斑图像的远程振动频率提取方法研究[J].激光技术,2016,40(6):801-805,5.基金项目
公安部技术研究计划资助项目 （）
