基于高阶谐振悬臂的动态原子力显微镜的研制

Tapping mode dynamic atomic force microscopy based on higher-order resonance cantilever

动态原子力显微镜微悬臂为无限自由度系统,具有多个谐振模态的振动特性。微悬臂的工作振动频率是影响动态原子力显微镜系统的测量特性的关键参数之一,为了提高微悬臂的谐振频率,结合悬臂的高阶谐振特性,研制了基于高阶谐振悬臂的轻敲式动态原子力显微镜,可实现对微观表面的测量,并且明显改善了动态原子力显微镜系统的测量灵敏度、测量速度等测量特性。

Shapes of resonators can affect the pressure ratio and the resonance frequency. In this paper, we had a simple theoretical analysis on the sound field of diameter changeable tubes. It concluded that reducer could increase the pressure ratio. Fluid fields in different reducer and expander tubes were calculated, and the results were compared with a straight tube under the same conditions. It shows that the reducer taper tubes and the reducer exponential tubes can obviously enhance the pressure ratio and decrease the resonance frequency of the tube.