基于声波驱动的高速变焦液体透镜振动特性分析

Vibration Characteristics of the Liquid Lens with High Speed Variable Focus Based on Activation of High Frequency Sound Wave

高速变焦液体透镜在快速移动物体的目标捕捉方面具有重要的应用。高频声波激励方法在理论上能够实现毛细腔边沿(靠表面张力)约束液滴的高速往复运动,但是相关工艺试验研究是目前该技术成熟应用的关键。文章在对毛细腔贯通液滴共振理论分析的基础上,基于3D打印技术开发了一种采用双源声波激励毛细腔贯通液滴进行振动的实验装置。在分析能量损失的基础上,采用激光多普勒测振仪分析了相关工艺参数对毛细腔贯通液滴振动频率和振幅的影响,总结了相关规律,为实现高速变焦液体透镜技术的应用奠定了基础。

High speed variable focus liquid lens have important application value in fast moving objects.The drive method of high frequency sound wave can realize the high speed reciprocating movement of the liquid drop by the constraint（by surface tension）of micro cavity edge in theory,but the related process experimental research is the key to the mature application of this technology.On the basis of theoretical analysis in this paper,an excitation test device of droplet vibration through micro cavity by dual acoustic sources was developed based on 3D printing technology.Based on the analysis of energy loss,the effect relationship between the relative technological parameters of the micro cavity and the vibration frequency and amplitude of droplet through the micro cavity was studied by using the laser Doppler vibrometer.Then the related rules were summarized,which provides a foundation for the realization of technology application of high speed variable focus liquid lens.