气液两相泡状流体监测用超声层析成象系统的研究

本文分析了带缺损的透射模式超声投影与流体中气泡分布状况之间的内在联系，提出了一种实时的二值逻辑滤波反投影图象重建算法，研制成功了气／液两相泡状流体分布监测用的透射模式超声层析成象系统。本文叙述了有关的理论基础和实时图象重建算法的实现，系在仿真和实验研究的基础上得出了若干有价值的结论。

Investigation of Ultrasound Tomography System used for Monitoring Bubbly Gas/Liquid Two-phase Fluid

On the basis of the fact that a bubbly gas/liquid two-phase fluid is a kind of strongly inhomogeneous medium according to its acoustic impedance distribution,the authors analyzed the inherent relation between the distribution of bubbles in fluid and their incomplete projections in a transmission-mode ultrasound tomograhy system. A mathematical model was established and a fast two-value logic based real-time filtered back-projection image reconstruction algorithm was also presented. Further,a transmission-mode ultrasound tomography system, which is expected to be used for monitoring the distributin of bubbly gas/liquid two-phase fluid,has been developed. In this paper, the fundamentals of this tomographic system and the implementation of real-time image reconstruction algorithm are described firstly. Secondly,the simulating and experimental investigation are given. Finally,the factors affecting the performance of the tomographic system are discussed and several conclusions are drawn as well.