中文摘要：

以空间脉冲响应为理论基础，建立了换能器空间声压模型，通过求任意时刻相交弧长对应圆心角的方法，计算了圆形和矩形换能器的脉冲响应函数，并仿真了其声轴线平面、横截面和声轴线的声压分布，通过与理论声压对比，仿真结果可以准确地反映换能器在空间辐射的声场。该方法对优化换能器设计参数和无损检测工艺、提高超声检测分辨率和可靠性有重要意义，也适用于其他形状换能器声场的计算。

英文摘要：

Based on space impulse response, a model has been developed, which can be used to calculate the ultra sonic field of transducer. The space impulse response functions of planar and rectangular transducers are calculated from the central angle corresponding to the intersected are. The ultrasonic field distribution along the beam axis and the ultrasonic field distributions projected in the transversal and longitudinal directions of the ultrasonic beam are simulated. The simulated ultrasonic fields are in good agreement with the theoretical sound pressure. The model can be used to optimize the transducer design and used in nondestructive inspection technique, which can improve the resolution and reliability of ultrasonic testing. In addition, this method can also be applied to calculate the ultrasonic fields of other transducers.