CAJ | 학술논문

通过对由纳米磁流体运动引起的双扫描激光散斑干涉光场及其变化做拉盖尔-高斯滤波下的傅里叶变换，获得动态散斑干涉图对应的光学涡旋分布及变化特征。分析认为，光学涡旋分布及变化对应着由纳米磁微粒及其团族的运动所引起的动态散斑变化。当纳米磁微粒聚集到分散的过程中，动态激光散斑光场的奇异场分布发生相应变化，说明了磁流体运动过程对应涡旋密度有先大后小，再由小变大的两个变化；并且光学涡旋密度高，对应较小颗粒的散斑场，磁流体处于稳态的状况；光学涡旋密度低，对应较大颗粒的散斑场，对应着磁流体激烈的运动。研究结果体现了奇异场分布变化和纳米磁流体动后趋稳的过程存在对应关系。
통과대유납미자류체운동인기적쌍소묘격광산반간섭광장급기변화주랍개이-고사려파하적부리협변환，획득동태산반간섭도대응적광학와선분포급변화특정。분석인위，광학와선분포급변화대응착유납미자미립급기단족적운동소인기적동태산반변화。당납미자미립취집도분산적과정중，동태격광산반광장적기이장분포발생상응변화，설명료자류체운동과정대응와선밀도유선대후소，재유소변대적량개변화；병차광학와선밀도고，대응교소과립적산반장，자류체처우은태적상황；광학와선밀도저，대응교대과립적산반장，대응착자류체격렬적운동。연구결과체현료기이장분포변화화납미자류체동후추은적과정존재대응관계。
The optical vortex distribution of the dynamic speckles in the interferometry and the corresponding variation characteristics were obtained by Fourier transform with Laguerre-Gaussian filter.The change of dy-namic speckle caused by the movement of the nano-magnetic particles is the same as appearing in the change of the singular distribution.And when the nanometer magnetic particles moved in the gathered process into dispered process,the dynamic speckle singularity distribution illustrated that there were two variations of the vortex density,to begin with from big to small,and to end with from small to big that corresponded to the mag-netic liquid movement.The optical vortex density is big corresponding smaller spot speckles and the magnetic fluid in the steady moving.The optical vortex density is little corresponding to the larger spot speckles and the magnetic fluid in the intensely moving.Research results indicate the existence of the relation between the movement of the nano-magnetic particles and the variations of the singular distribution.