聚焦区域高声强声场分布的测量方法研究

常用的声场分布测量是采用水听器扫描声场的方法,该方法对于声能量密度较大的声场难以测量,因为在这种情况下声振幅比较大,水听器在这种声场中呈现非线性或遭到破坏。设计了一种用辐射压力测量高声强声场分布的方法,该方法利用一根微细管,直接测量声场的冲流压力,通过对声场进行扫描测量可以得到高声强声场压力分布。从理论上分析了这种测量方法的可行性,对测量基本要求及实验装置做了阐述。实验结果证实:该方法可以用来测量高声能密度声场压力分布;测量结果与水听器测量结果基本吻合;测量方法存在测量盲区。

Measurements of high pressure focused acoustic field

The traditional method for measuring the ultrasound field distributions is to scan the field by hydrophone. However, hydrophone can not be used because it will be nonlinear working or be destroyed in a high acoustic energy density field. A ultrasound field measurement method to measure the acoustic radiation pressure is developed, which can be used to measure the high pressure acoustic field. It uses a micro-tube to measure and to scan the radiation pressure of acoustic field. The feasibility of this method is analyzed theoritically and the experiment settings are described. Experiment results show that it can be used to measure high pressure acoustic field. Experiments results are similar with that measured by hydrophone. Blind area appears in the measuring area.