摘要
利用无限分割后积分的方法,对圆形发射面发射的波在中轴线上的分布做了理论计算和分析,定量得到中轴线上振幅分布,根据整体趋势,分析得到远近场判据。在此基础上,使用不同尺寸的圆形超声波换能器,通过数值模拟及实测的方法得到中轴线附近超声波波场振幅分布,此结果与理论推导非常吻合。进而又使用换能器阵实测,得到了与单个换能器相近的结果,至此波场轴线上振幅分布规律以及对波源远近场的判据得到了验证,为以后的实验提供理论基础。
The concept of point wave source is frequently used in the research both theoretically and experimentally. However, there is no absolute point wave source in the real world, how to delimit the near-field and far-fieht is very important both experimentally and praetically for the definition of the point wave source. In this article, tile amplitude distribution of round emission surface was recalculated by unlimited dividing and integration. A more accurate criterion was obtained and verified with ultrasonic transducers of multiple sizes by numerical simulation and experiment. And transducer array is also used to get the similar result. It will become the base of the further experiments.
出处
《实验室研究与探索》
CAS
北大核心
2013年第12期35-37,53,共4页
Research and Exploration In Laboratory
基金
国家级大学生创新创业训练计划项目(201210246001)
关键词
点波源
超声波
换能器
point wave source
ultrasonic wave
ultrasonic transducer
