SGER: Light Scattering Manometer

这是一项探索性研究（SGER）小额资助项目，旨在开发和校准一种新型压力计，该压力计可以感知湍流和几乎层流流体（例如空气或水）中微小、快速的压力波动，同时在流动中引入最小的扰动。如果成功，该仪器可能会在研究循环系统、心脏和其他生物医学环境中的小压力变化方面找到额外的用途。这项独特的新技术使用了一小块软透明凝胶，其中含有微米大小的粒子，因为它们具有光散射特性。压力波动弹性地压缩凝胶。在颗粒间分离中测量的时间相关性可以直接与凝胶传感器所经历的压力相关。该压力计对亚帕斯卡级（1mmhg = 130pa）的压力波动敏感，频率范围从直流到高于10khz。现有的（应变计）压力传感器仅限于墙壁区域。该传感器可以监测大流体区域，为湍流测量提供了很大的优势。将支持一名研究生参与该项目。该项目是与工程局化学和热系统部门的流体动力学和水力学计划共同资助的。这是一项探索性研究（SGER）小额资助项目，旨在开发和校准一种新型压力计，该压力计可以感知湍流和几乎层流流体（例如空气或水）中微小、快速的压力波动，同时在流动中引入最小的扰动。如果成功，该仪器可能会在研究循环系统、心脏和其他生物医学环境中的小压力变化方面找到额外的用途。将支持一名研究生参与该项目。该项目是与工程局化学和热系统部门的流体动力学和水力学计划共同资助的。

This a Small Grants for Exploratory Research (SGER) project to develop and calibrate a novel manometer that senses small, rapid pressure fluctuations in turbulent and almost laminar fluids (e. g., air or water), while introducing minimal perturbations in the flow. If successful, the instrument may find additional use in studying small pressure variations in the circulatory system, the heart, and in other biomedical settings. The new and unique technique employs a small volume of a soft clear gel containing micron-size particles chosen for their light scattering properties. Pressure fluctuations elastically compress the gel. Measured time correlations in the inter-particle separations can be directly related to the pressure experienced by the gel sensor. The manometer will be sensitive to pressure fluctuations at the sub-Pascal level (1 mm Hg = 130 Pa), and with a frequency range from dc to higher than 10 KHz. Existing (strain-gauge) pressure sensors are confined to wall regions. The proposed sensor can monitor the bulk fluid region, a great advantage for turbulence measurements. One graduate student will be supported to work on the project. The project is co-funded with the Fluid Dynamics and Hydraulics Program in the Division of Chemical and Thermal Systems in the Engineering Directorate.This a Small Grants for Exploratory Research (SGER) project to develop and calibrate a novel manometer that senses small, rapid pressure fluctuations in turbulent and almost laminar fluids (e. g., air or water), while introducing minimal perturbations in the flow. If successful, the instrument may find additional use in studying small pressure variations in the circulatory system, the heart, and in other biomedical settings. One graduate student will be supported to work on the project. The project is co-funded with the Fluid Dynamics and Hydraulics Program in the Division of Chemical and Thermal Systems in the Engineering Directorate.