用于超声悬浮场可视化的光学全息相位倍增方法研究

基于二次曝光全息干涉测量原理,采用四倍相位倍增光路对声悬浮声压场分布进行了可视化研究.拍摄了给定模式的超声悬浮场在不同超声换能器激励电流时的光学全息图并进行光学再现,由再现光波的全息干涉条纹图样得到了反映声压场分布的光波波前相位变化,并进行了对比分析.结果表明,与无相位倍增光路相比,采用四倍相位倍增光路可使同一声压场的全息干涉条纹数目大大增加,测量灵敏度明显提高,为进一步研究声悬浮场声压分布提供了一种有效方法.

Visual Investigations of Acoustic Levitation Field Using Holographic Interferomtory with Phase Multiplication

Using double-exposure holographic interferometory with quadruplicate phase multiplication,the visual investigations of the acoustic levitation field were carried out.The holographic interference patterns reflecting the sound pressure distribution were obtained from the acoustic levitation field under a given restonant mode at different inspirit currents.The phase difference distribution obtained by the holographic interference pattern of the acoustic levitation field.was analyzed.The result shows that the proposed setup with quadruplicate phase multiplication can obviously increase the fringe number of the interference phase pattern of the acoustic levitation field and enhance the measurement sensitivity,and it provides an effective way for studying the sound pressure distribution of the acoustic levitation field.