US 6367328 B1

 

　　Ultrasonic energy in the form of guided waves is launched into the wall of a fluid-filled container. The guided wave propagates around the circumference of the container from a transmitting transducer to a receiving transducer. Part of the guide wave energy leaks into the fluid in the form of bulk waves, reflects off the inner wall on the other side and enters back to the receiving transducer trailing the direct wave. Analysis of the received waves determines the presence of corrosion pitting and MIC nodules on the container inner wall, and fluid level. In addition, it determines whether foreign objects are inside the container. The guided waves are created with wideband transducers excited at certain frequencies that depend on the material and geometry of the part being measured. The leakage energy is maximized with a shaped tone burst pulse at the specified frequency. The energy and energy ratio of both the direct and leakage fields are measured and related to the container inner wall condition and the presence of any foreign objects in the fluid.

 

　　超声能量以导波的形式发射到充满液体的容器的壁。导波传播围绕这个容器的周围从一个发射换能器到一个接收换能器。部分导波的能量以体波的形式泄漏到流体中，通过另一侧的内壁反射回来的，并返回到接收换能器后成为直接波。对所接收到的波的分析决定在容器内壁的腐蚀点和MIC结节，和流体水平。此外，它确定异物是否是在容器内部。导波通过在特定频率激发的宽带换能器产生，依赖于被测量部件的材料和几何形状。漏感能量通过形音猝发脉冲的作用在指定的频率最大化。直接和漏磁场的能量和能量比率计算，与容器内壁条件和流体中任何异物存在有关。