论文部分内容阅读
本文根据基尔霍夫积分．推导出了用于胎儿监护的梅花形超声多普勒探头声场的具体表达式．对中心大圆晶片发射、周围六个小圆片接收，以及七个相同晶片四发三收两种典型布局的换能器，其轴上声压分布，离辐射面不同距离断面上的声压分布及不同定向平面上的远场指向性进行了数值计算．结果表明，采用四发三收式结构较一发六收式结构具有较大的优越性．计算结果与实际测试结果很好地吻合．本项研究对此类探头的研制、使用及质量评价标准的制订，具有理论指导意义．
This article is based on Kirchhoff points. The specific expression of the sound field of the Plum-shaped ultrasonic Doppler probe for fetal monitoring is deduced. On the center of the wafer launch, surrounded by six small discs to receive, and seven identical four wafers three receive two typical layout of the transducer, the axis of sound pressure distribution, radiation from the surface at different distances across the section of the sound pressure distribution And the far-field directivity on different directional planes were numerically calculated. The results show that the use of four rounds of three close-type structure of a hair six-type structure has greater advantages. The calculated results are in good agreement with the actual test results. The research on the development of such probes, use and quality evaluation standards, with theoretical guidance.