这是一个仿真圆形超声波探头所发射的超声场在中轴线上的声压分布图。-This is a circular ultrasonic probe ultrasonic field in the central axis of the emitted sound pressure distribution of a simulation.

基于keil软件编写的液晶显示距离（需要配超声波探头）-Keil software development based on liquid crystal display distance (needs with the ultrasonic probe