High-speed, plane-wave ultrasound imaging for Lagrangian particle tracking

为了支持与使用拉格朗日粒子跟踪研究复杂流体动力学有关的几个并行研究项目，需要一种能够进行平面波成像的超高速超声系统。拉格朗日路径信息使我们能够计算随时间变化的压力场，估计卷吸，并适当地表征稠密悬浮液中的相互作用。通常，流体物理是通过使用激光和照相机的光学技术测量的，而不透明或半透明的测试部分和流体禁止使用这些光学技术。超声成像没有同样的限制，开辟了一系列新的实验，包括活体流动跟踪和流体-结构相互作用。然而，市场上的大多数超声系统仅限于200赫兹以下的帧速率。收购所要求的系统将解除我们流体动力学实验的任何限制，使用平面波技术将帧速率大幅提高到100,000赫兹。新系统将使研究高雷诺数、多相流通过复杂和灵活的几何形状成为可能。作为加拿大首批使用这一最先进超声系统的工程实验室之一，我们有信心将自己定位于全球领先的流体动力学研究人员之列。因此，考虑到目前正在进行的拉格朗日数据重建的快速变化，这里所要求的超声系统将有可能产生重大和持久的影响。

An ultra-fast ultrasound system capable of plane-wave imaging is requested in support of several parallel research projects pertaining to the investigation of complex fluid dynamics using Lagrangian particle tracking. Lagrangian pathline information enables us to calculate time-varying pressure fields, estimate entrainment, and properly characterize interactions within dense suspensions. Typically, fluid physics is measured via optical techniques using a laser and cameras that are inhibited by opaque or translucent test-sections and fluids. Ultrasound imaging does not suffer from the same limitation and opens a new range of experiments, including in vivo flow tracking and fluid-structure interactions. However, the majority of the ultrasound systems on the market are limited to frame rates below 200Hz. Acquisition of the requested system will lift any restrictions from our fluid dynamic experiments by drastically increasing the frame rate to 100,000Hz using plane-wave technology. The new system will enable the investigation of high Reynolds number, multi-phase flows through complex and flexible geometries. As one of the first engineering laboratories in Canada to work with this state-of-the-art ultrasound system we are confident that we will position ourselves amongst leading fluid dynamics researchers around the globe. Therefore, considering the rapid changes in Lagrangian data reconstruction occurring now, an opportunity for significant and lasting impact will be possible with the ultrasound system requested here.