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Time-of-Flight Application for Fluid Flow Measurement

机译：飞行时间在流体流量测量中的应用

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摘要

Fluidic measurement is a critical part of clinical care and homeostasis maintenance. This paper reports feasibility study of measuring flow velocities over a wide dynamic range using a non-contact measurement technique, optical time-of-flight (OTOF), with the objective of developing a compact instrument that can be used to measure fluid flow for IV medication delivery. In this study, a 1480nm laser diode focused to a 20μm spot introduces a heat bolus into the fluid. This localized temperature increase results in a correlated change in refractive index, detected downstream by observing defocusing of the visible beam, focused to a 10μm spot in the center of the fluid path. The OTOF measurement provides the centerline velocity of the fluid flow. CFD modeling ensured that laminar flow was fully developed; prior to the OTOF measurement point, thus providing a simple, empirical relationship between OTOF and fluid velocity, and hence volumetric flow rate. Measurements have been performed over a wide range of flow velocity from 1 mm/s to 1 m/s with approximately ±5% measurement error for broad ranges of fluid properties such as viscosity (0.77-13.88 cp), density (0.98-1.17 g/cm~3) and temperature (5-35℃). The dynamic range of measured velocity/flow rates is a function of the distance between the heating and the detection laser beams.
机译：流体测量是临床护理和体内平衡维持的关键部分。本文报告了使用非接触式测量技术（光学飞行时间（OTOF））在宽动态范围内测量流速的可行性研究，目的是开发一种紧凑的仪器，该仪器可用于测量IV的流体流量。药物输送。在这项研究中，聚焦到20μm点的1480nm激光二极管将热推注引入到流体中。这种局部温度升高导致折射率的相关变化，通过观察可见光束的散焦在下游将其聚焦到流体路径中心的10μm点，从而检测到相关的折射率变化。 OTOF测量提供了流体流的中心线速度。 CFD建模确保层流得到充分发展；在OTOF测量点之前，因此提供了OTOF与流体速度以及体积流量之间的简单经验关系。在从1 mm / s到1 m / s的较大流速范围内进行了测量，对于诸如粘度（0.77-13.88 cp），密度（0.98-1.17 g）的广泛流体特性，测量误差约为±5％ / cm〜3）和温度（5-35℃）。测得的速度/流速的动态范围是加热和检测激光束之间距离的函数。

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