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.
