摘要
利用飞秒激光散斑的信息,可以得知散射体的空间运动信息.为此提出了飞秒激光散斑相关测量技术,将散射体变化或移动前后的飞秒散斑场分别用CCD探测器记录下来并储存于计算机中,对移动前的飞秒散斑场和移动后的飞秒散斑场进行相关性运算,就可以确定出散射体的有关特性或移动量,实现对飞秒散斑场移动实时测量.结果表明,实验中散射体的位移量与用相关算法得到散射体的移动量相吻合,证实了飞秒散斑相关法测量的可行性.
Displacement of the scattering media from speckle information can be obtained. So a novel femtosecond laser speckle technique was proposed. For measuring the displacement of a scattering object by using two images which are taken before and after the object moved. Since the two images are recorded by a charge coupled device （CCD） camera and stored on separate frames in computer, it is possible to use a cross-correlation algorithm to determine the displacement field in real-time. In experiment, displacement of the scattering media is in agreement with the result obtained by cross-correlation algorithm. It is shown that femtosecond laser speckle cross-correlation technique should be a useful for measuring the movement of a scattering object under femtosecond laser illumination.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2006年第11期1477-1480,共4页
Chinese Journal of Lasers
关键词
超快光学
飞秒激光
散斑
互相关
自相关
ultrafast optics femtosecond laser speckle cross-correlation autocorrelation
