微米颗粒粘附力的光学测量法.PDFVIP

第 30 卷 　第 11 期 中　 国 　激 　光 Vol . 30 , No . 11 　 2003 年 11 月 CHINESE JOURNAL OF LASERS November , 2003 　 ( ) 　　文章编号 : 2003 微米颗粒粘附力的光学测量法 范建国 , 夏宇兴 (上海交通大学物理系 , 上海 200030) μ 摘要 　分析了吸附于介质表面的微米颗粒所受的力 ,并通过理论模型估计了直径为 15 m 的小球在表面所受到的 粘附力为 10 - 6 N 量级 。同时利用脉冲激光的光压对吸附于蓝宝石玻璃表面的玻璃小球进行了粘附力的测量 。测 量结果和理论计算值吻合 。在给定实验条件下 ,粘附力的大小主要是由毛细力决定的。 关键词 　应用光学 ;光压 ;粘附力 ;毛细力 中图分类号 　O 348. 11 　　　文献标识码 　A An Optical Measurement Method for Adhesion of Microparticles FAN Jianguo , XIA Yuxing ( Dep artment of Physics , S hanghai J iaotong University , S hanghai 200030 , China) Abstract 　The adhesion forces between the microparticles and the dielectric surface were analyzed. The adhesion of a particle - 6 with 1. 5 microns in diameter to a surface was estimated to be about 10 newtons. Experimentally , the optical pressure of a focused laser pulse was used to determine the adhesion between the quartz particles and a sapphire surface . This pressure was found to be very close to the estimated adhesion . It was also shown that the capillary force was the dominant component in the experiment . Key words 　applied optics ; optical pressure ; adhesion ; capillary force 1 　引　言 　　脉冲激光技术的发展使光能量可以聚集到很短 ( )