中文摘要：

为了检测医用体外碎石机焦点位置的声场特性，判断是否符合国家标准要求，特采用直接测量的方法，使用针式水听器在时间和空间域内进行逐层扫描，寻找焦点位置并测量焦点位置的声压强度；通过能量图直观显示焦点位置的能量分布，通过测量采集到焦点位置连续10次冲击波的声场强度、脉冲上升时间、脉冲宽度．这样所得到的医用体外碎石机焦点声场特性符合国家标准的要求．

英文摘要：

To test the sound field characteristics of the focal position of EWSL and to determine whether the standard is in compliance with relevant national standards, the needle hydrophone was used to scan the layers in the time and space domain so as to find the position of the focus and to measure the sound pressure intensity at the focal position. The energy distribution of the focal position was displayed by the energy chart. Through the measurement, the sound field intensity, the rise time and the pulse width of the 10 shock waves were collected. The results show the EWSL focus sound field characteristics meet the national standards.